How Many Fans Should Be Used In Growing Tent

How Many Fans Should You Have In Your Grow Tent?

Isn’t it wonderful when a cold wind gently caresses your skin as it slitters away from you? Invigorating and purifying, the soft breeze tickles your senses while clearing the air of contaminants. Cannabis plants like the wind just as much as humans do, but they require it more for survival than for pleasure. Outside, the leaves of cannabis plants sway smoothly in the breeze because the wind swishes past them in a constant stream. As a result, outdoor cannabis farmers aren’t bothered by fans in the least.

The airflow in the grow tent must be within a favorable range in order for the plants to thrive and produce properly.

How Many Fans Should You Have In Your Grow Tent?

For the majority of tents, two fans will enough. Every grow tent should be equipped with an oscillating fan and an exhaust fan to ensure that the flow of air in the tent is balanced. The number of fans you will require in your grow tent, on the other hand, is determined by the size of the tent, the sort of lighting you are using, and the size of the fan itself. Knowing how many fans to employ in each area of your grow room is critical since fans are critical to the development and well-being of your cannabis plants.

  • Because of the swooshing air that whips the branches back and forth, they are forced to create the muscle that will be required to house the impending large buds.
  • The plant takes in CO2 to aid in photosynthesis, and airflow is critical in dispersing CO2 throughout the plant to ensure optimal food production.
  • This allows the plant to absorb more nutrients from the air they are exposed to.
  • Unless you intend to use CO2 as a fuel, the intake fan should be rather efficient.
  • Even worse, if the level falls below 150 parts per million (ppm), the plants may wilt as a result of famine and may die.
  • As a consequence of photosynthesis, the plant will release oxygen, which is assisted by an exhaust fan, which helps to expel’stale’ air from the growing environment.
  • You’ll need enough fans to support the plant’s metabolic and photosynthetic activities in addition to the amount of water it requires to survive.

Let’s take a closer look at the many aspects that influence the quantity of admirers you should have. Oscillating fans promote air circulation within the tent; make sure you have one!

Factors That Influence The Number Of Fans You Should Have In A Grow Tent

The amount of fans to utilize is not something that can be determined by whipping your head back and forth. If you have an excessive number of fans running in your grow tent, the wind may actually increase transpiration. If you only have a few fans for the tent, the heat generated by the light and precipitation may pose a threat to your plants’ health. The following are the considerations to make when determining the number of fans to install in your grow tent:

Accessories Attached To The Fan

Sometimes you have to go above and above to ensure that the tent atmosphere is appropriate for the plants to thrive in or that your grow operation runs well without the presence of prying eyes. This entails the installation of accessories such as carbon filters to keep the scent contained and ducting. These have an impact on the fan’s performance. Airflow is impeded by these devices, which decrease the effectiveness of the fans. The greater the number of bends and tight tubes that the fan must push air through, the slower the fan moves.

It is estimated that a 90-degree curve will reduce efficiency by 60%, and a 30-degree curve will reduce efficiency by 20%, which is still considerable.

Size Of The Fan

Larger fans are more effective than little fans. They are designed to deliver exceptional performance. An 8″ inline duct fan that produces 420 CFM will have a greater airflow than a 6″ duct fan that produces 280 CFM will have.

Tent Size

When determining the quantity of fans to utilize, the size of the tent is quite important. Increasing the number of large tents pushes the plants further away from the fan, decreasing the evenness of air circulation. Because of the restricted ventilation, there may be areas within the tent where the air becomes stale, resulting in greater humidity and temperatures. If the tent is too large, you will want more fans. When you have a 55 tent, one 6″ inline exhaust fan and one oscillating fan will do the trick nicely.

The Type of Light

Lights that produce more heat will require the fan to run for a longer period of time in order to cope with the higher temperatures. Increasing the number of fans enhances their efficiency, resulting in increased airflow. As a result, when dealing with excessive heat generated by high-pressure sodium (HPS) grow lights, investing in more powerful fan ducts can be a lifesaver. A greater number of fans helps to keep the room cooler while also decreasing water loss through evaporation. In order for the plants to lose so much water, the grow tent’s humidity levels must be kept at a high level, making the plants more susceptible to deficiencies and mold infections.

Grow Fans We Recommend

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Frequently Asked Questions About Grow Fans

In a grow room, how long should a fan be turned on? The fans are required during the daylight hours, when the plants are actively engaged in photosynthesis and the sun is shining directly on them, raising the temperature within the tent significantly. After you’ve turned out the lights, turn on the fans for 1 hour to cool the room. Leaving the fans running for an extended period of time promotes water loss, which reduces humidity to unsafe levels. Is it necessary to have fans in a 5 x 5 grow tent?

  1. Air is circulated more effectively within the tent thanks to the exhaust fan and the oscillation fan.
  2. In a grow room, is it possible to have too much airflow?
  3. Over-exertion of the airflow lowers humidity, dries out the leaves, and can even result in leaf ripping.
  4. The longer the air in the grow tent remains stagnant, the greater the likelihood of mold infection in the growing environment.
  5. In summary, the amount of fans you require will be determined by your changing circumstances.
  6. When growing in a 55 tent, on the other hand, you only need one exhaust fan and one oscillating fan to ensure that your grow tent is well ventilated.

How many fans do I need in my Grow Tent?

In order for the air to circulate properly in your grow tent, it is recommended that you have at least two medium-sized fans installed in your grow tent. Simply set one fan above your plants and another on the ground to get the desired effect. The correct fan size for a 4x4grow tent is as follows: The majority of 4x4tents size 48 inches by 48 inches by 80 inches. A 4x4grow tent has an overall capacity of 106.67 cubic feet, which is equal to 4ft (length) x 4ft (width) × 6.667ft (height) multiplied by four.

  1. Aside from that, how much of a tent do I need for four plants?
  2. For this size growtent, we recommend that you fit four full-size plants in it, allowing you plenty of room to move about.
  3. You may also accommodate 16 small-sized plants that will grow to be no more than 2 feet in height in this space.
  4. 8-inch fans are typically utilized for higher-powered grow operations.
  5. Calculate the cubic area of your place by multiplying the dimensions of its length, width, and height.

You should be able to expel this quantity of air at least once every minute. What is the maximum number of plants that can be grown in a 3×3 tent? Growers that use this form of plant training may fit a maximum of four plants in a three-by-three-foot tent.

Grow Tents and Fans: 11 Things to Know

There are several advantages to growing plants indoors. You have total control over the growth conditions, and there are few restrictions on the kind of plants you may raise. Many individuals are preoccupied with all of the other things necessary for the continued development of their plants, and they overlook the need of ventilation. While it may appear that a corner fan would meet all of your ventilation requirements, this is not the case. Grow tents require enough air in order to guarantee that all of your plants flourish and develop properly.

Grow tents and fans have a number of considerations that you should be aware of.

Why Do You Need Fans in Your Grow Tent?

If you want to keep your grow tent fresh, you’ll need to install a fan as well as an air evacuation system. The reason behind this is as follows:

  • Removing excess heat from grow lights: too much heat can interfere with the growth of a plant
  • Controlling humidity is important because plants emit water vapor throughout the day. Uncontrolled humidity can lead to the spread of pests and illnesses if not properly ventilated. Maintain control over CO 2: Plants require CO 2 for their nutritional cycle, and they obtain it from the surrounding air. Ventilation enables the circulation of fresh air, which in turn helps to increase plant development and yields. To make the plant stronger: Constant airflow makes the plant stems robust, guaranteeing that they can withstand the weight of their harvest when they begin to bear fruit.

How Many Fans Do You Need in a Grow Tent?

According to general guidelines, you should have at least two medium-sized fans to maintain adequate ventilation in a grow tent, but more is better. You may set one fan above the plants and the other on the ground to create a wind tunnel effect. Oscillating fans are the most effective since they do not concentrate air on a single area of your plants, avoiding windburn from occurring. Take note of how even the airflow is within your grow tent to evaluate whether or not you require more fans. If there is no wind in one location, consider adjusting the fans so that the air is distributed evenly around the room or adding an additional fan.

2X2 Grow Tent

Because a 2×2 grow tent is very tiny, you won’t need as many fans as you would in a larger tent. However, even in a tiny area, proper ventilation is essential to ensuring that your plants develop to their full potential. A minimum of one exhaust fan should be installed in such a space, which will help to exhaust the air from within to the outside while also allowing new air to enter. To circulate air within the grow tent, you’ll also need a second fan to be installed within the grow tent.

2X3 Grow Tent

A 23 is similar in size to a 22, and both are fairly tiny. This tent will also require at least one exhaust fan to guarantee that air is continuously exchanged inside and outside the tent, as well as at least one oscillating fan to ensure that appropriate airflow is maintained inside the tent.

2X4 Grow Tent

To properly ventilate this grow tent, you’ll need at least two oscillating tents inside to keep the air moving, as well as one exhaust fan to guarantee that fresh air is always flowing through the tent.

3X3 Grow Tent

This grow tent will require at least two oscillating tents and one exhaust fan to guarantee that there is a continual flow of fresh air within the tent during its operation.

4X4 Grow Tent

To properly ventilate this grow tent, you’ll need at least two oscillating tents inside to keep the air moving, as well as one exhaust fan to guarantee that fresh air is always flowing through the tent.

5 X 5 Grow Tent

Because a 55 grow tent houses more plants than a 44 grow tent, you must ensure that there is sufficient air flow in the grow tent. According to basic guidelines, one oscillating fan should be strategically placed above the plants and another should be placed on the ground, ensuring that they are both emitting a mild breeze. An exhaust fan is also recommended to ensure that heated air is expelled and fresh air is brought in on a consistent basis.

Where to Place Fans in a Grow Tent?

When it comes to fan placement in a grow tent, you have two alternatives. You have the option of putting the fan outside or within the grow area. What’s the difference between the two? If you set the fan outside, it will draw air from within the tent to the outside through a duct in the tent’s top corner, which will help to keep the temperature comfortable. If you opt to install the fan indoors, you’ll also need a filter to keep the air clean. The filter should be placed at the very top of the tent, where the warmest air is circulating.

In outdoor settings, it may be difficult to get the fan to sit in the ideal position.

Should You Use Oscillating Fans in A Grow Tent?

Oscillating fans are ideal for grow tents since they provide a variety of advantages, including the following:

  • Reasonable pricing, high efficacy, and ease of set-up Your plants will benefit from the air that is blown above, under, and around them. They’re lightweight, which makes it easy to move them about and experiment with location

In the event that you decide to utilize oscillating fans, it is advisable to purchase a number of fans in order to ensure that there is appropriate ventilation throughout the tent. To avoid windburning your plants, make sure you are not directing the fans directly towards the plants themselves.

Should Fans Be Left On When Grow Tent Lights Are Off?

Yes. Despite the fact that your plants are not creating as much moisture or heat when the lights are turned off, you must still maintain proper ventilation to promote maximum development. When the lights are turned off, lower the fan’s speed or set it to operate for only 15 minutes each hour during the day. When it’s dark, the air circulation will guarantee that there is enough ventilation.

Do Grow Tents Need Fans for the Exhaust Vents?

Yes. In order to keep the temperature and humidity in your grow tent under control, it is recommended that you install oscillating fans in the tent. Fans, on the other hand, are insufficient. It is necessary to have an air extractor system in place in order to keep the grow tent clean. An air extractor fan system removes stale air and replaces it with fresh air, which is essential for the health of your plants. It is recommended that you replenish the air in your grow tent with fresh air every minute, or at the very least every three to five minutes, by using an extractor fan system.

Zdasiuk took the photograph.

How Big Should Grow Tent Fans Be?

A common rule of thumb when it comes to replenishing air in a grow tent is to replace all of the air in the tent once per minute.

The cubic feet per minute (CFM) rating is used to express this measurement. To calculate CFM, you’ll need to know the following information:

Multiply the length, breadth, and height of your grow tent to find the total volume of your structure. The cubic measurement of your room is the outcome of this calculation. Keep your hands on the number you were given. Then you need to multiply that by the efficiency loss to get the final result. The effectiveness of the filter varies depending on several factors, including the make and age of the filter and the length of the duct between the filter and the fan. A good rule of thumb is to double the capacity of your room by two if your duct is only a few feet long.

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The following is the formula to use: CFM = volume of the room multiplied by the efficiency decrease Once you have your CFM value, you should seek for a fan that has a greater CFM value than that.

The following are some of the most common grow tents, as well as the fan sizes you’ll require.

Grow Tent Size CFM for no Duct CFM for 1 Duct Bend
2×2 grow tent 40 55
2×3 grow tent 50 65
2×4 grow tent 80 110
3×3 grow tent 90 120
4x grow tent 160 215
5×5 grow tent 240 340

Remember that the CFM output of inline fans for grow tents will not be exactly the same as the CFM output you may be searching for. As a result, while searching for a fan, it is recommended to get one that has a CFM rating of 50 to 100. A fan with an adjustable setting is also an excellent choice since it allows you to modify the CFM to meet your specific demands.

What is the Difference Between an Exhaust Fan and an Intake Fan for Grow Tents?

Exhaust fans, also known as extractor fans, are put in your grow tent to exhaust the hot and humid air that has accumulated there. Air ducts are used in conjunction with them to direct the air flow away from the tent. In contrast, intake fans are equipment that are used to deliver fresh air into a grow room from the outside or from another room inside the same building. It is critical to the growing process that an intake fan be used since it maintains the air fresh and helps to replace the quantity of carbon dioxide and oxygen in the air.

However, in order to accomplish this successfully, you must understand how to adjust the fan’s power so that it operates properly.

How Long Should Fans be Left on in Your Grow Tent?

How long you should leave your fans running in a grow tent is determined by a number of factors. These are some examples:

  • The size of the grow tent: When compared to larger grow tents, smaller grow tents require shorter intervals between turning on the fans. Fan CFM:If your fan has a low CFM, you’ll have to leave it on for longer periods of time than if your fan has a high CFM. Choose the appropriate fan for your grow tent based on the size of the space you have available. Fan usage in grow tents: Fans are used in grow tents for a variety of purposes, ranging from managing humidity to purifying the air. If you’re using it to reduce the humidity, for example, you should switch it off after the humidity has returned to the desired levels of humidity. Determine why you require the fan and then alter its length in accordance with the demands of your plants. Hours of light and darkness: Plants generate a great deal of heat and moisture during daylight hours, hence it is advised that the fan be kept running during the daylight hours. Low-speed fans should be used during the nighttime hours, and they should be kept running for around 15 minutes every hour, because the plants will not be creating as much heat at this time. Stage of plant development: Depending on their stage of development, plants require varying quantities of airflow. Keep an eye on the stage of development and adjust the airflow as necessary

Can You Have Too Many Fans in a Grow Tent?

Yes. Before you spend money on fans for your grow tent, make sure you do your research. Before you purchase any fans, you need determine the CFM of your grow tent in order to have an estimate of how many fans you’ll need to achieve optimal performance. Additionally, you should make certain that the space has a calm breeze rather than a strong wind storm. Too much airflow can have detrimental consequences on your plants, either by generating excessive transpiration or by causing damage to the leaves of your plants.

You may believe that your plants are suffering from nitrogen toxicity or watering problems, but in fact the problem may be excessive wind exposure.

The damage is usually more severe when the wind is blowing harder than it is where it is not blowing. Leaf clawing, cupping, and curling, as well as the appearance of dead leaves, are some of the indicators of excessive airflow.

How to Prevent Windburn

If you’ve calculated the CFM and are confident that you have the appropriate number and size of fans, but you’re still experiencing windburn, try the following to resolve the issue:

  • By moving the fans in a single direction, you can ensure that the location of the fans is even above and below the canopy
  • And Create a mild wind with the fans that is just enough to move the leaves and not the entire plant. Plants should not be placed directly in front of a fan, regardless matter how little the fan is. In some cases, direct airflow can have a detrimental influence on plant development and growth. Opt for oscillating fans instead. They’re simply adjustable, and they’re also inexpensive.

How to Make Grow Tent Fans Quieter

The noise produced by grow tent fans might be a source of irritation. Fortunately, you do not have to put up with it. If you want to make the fans more silent, there are various things you may do to help. These are some examples:

Suspend the Fans in an Enclosure

When the vibrations from your fan travel through the walls, the ground, and the ceilings, noise is produced. The most effective solution to resolve this issue is to install your fan in an enclosure, such as a wooden box, that is completely isolated from any other surface. Hang the fans from the ceilings with bungee cords to keep them in place. Repeat the process for the ducts. To obtain the greatest amount of noise reduction, repeat the process for all of your fans and ducts.

Soundproof Your Grow Tent

In a grow tent, fans aren’t the only gadgets that generate background noise. Air pumps and exhaust ducts may be quite loud as well. As a result, even after turning down the fans, the noise may continue to be an annoyance. Soundproofing the tent is the most effective technique to cope with this problem without having to conduct extensive structural work. Heavy vinyl curtains are a simple and economical solution that can be installed quickly. You’ll need to invest in strong sound-damping materials such as rubber, though, if you want to block out even more noise and vibrations from the environment.

This improvement will go a long way toward reducing the amount of noise in the area.

Closing Thoughts

If you want your plants to thrive in a grow tent, you must provide them with adequate ventilation. Fortunately, if you know the CFM of your tent, determining which fans to use and how many to buy is a piece of cake. Getting the correct fan for your grow tent, on the other hand, isn’t enough. Furthermore, you must be aware of the proper placement of fans as well as how to alter their settings so that the airflow rate is good for the growth of your plants. With the help of this article, you will be able to say goodbye to ventilation problems in your grow tent.

Cannabis grow tent fan setup: What size grow tent fans are needed for proper air circulation

When putting together your grow tent fan arrangement, you’ll need to consider the following sorts of fans:

  • The use of circulation fans to circulate air about the ten or grow room is recommended. Inline exhaust fans remove warm air from the tent (as well as from lamp hoods that are air cooled)

In this post, we’ll go through how to properly set up grow tent fans to ensure adequate air circulation. Alternatively, you may learn more about inline grow tent fans by visiting this page. Both grow tents and grow rooms necessitate the use of fans for circulation as well as separate exhaust fans to provide optimum ventilation. It is not sufficient to simply circulate air within the building. Your circulation fans will be pumping stale, hot, humid air that is devoid of the required carbon dioxide if you do not have exhaust fans installed.

As a result, while designing your grow tent fan system, make sure to account for optimum air circulation and exhaust.

For additional information on ventilation, read articles on how to set up grow tent ventilation or how much ventilation is required in grow tents, among other topics. To discover more about the finest clip-on and floor fan types for usage in grow tents, see ourgrow tent fan reviews page.

Why is air circulation needed for marijuana plants

Clip-on fans are a terrific method to circulate air above the canopy of your cannabis grow tent, and they are inexpensive. A steady supply of fresh air containing a high concentration of carbon dioxide is ideal for marijuana growth (CO2). Plants require a continuous source of new carbon dioxide. This is given by the wind in the case of outdoor cultivation. This may be achieved by maintaining a continual stream of air movement around your plants, which helps to refill the CO2 levels in the environment.

For proper air circulation inside the tent, you’ll need grow tent fans fans to ensure that the fresh air reaches all regions of your trousers.

Plants respond to the wind by strengthening their branches, which helps them to survive.

Where to set up grow tent fans

When you have several circulation fans in your grow tent or grow room, your marijuana will flourish at its finest.

Above the canopy

Allowing air to move across the top of your canopy absorbs the heat generated by your grow lights while also supplying CO2 to the plants’ growing tips and buds. Ideally, your fans should be positioned such that they cover as much of the canopy as feasible. It is best to softly stir the leaves rather than blasting air directly at them, as this may result in wind burn. Secret Jardin Monkey Fans are a terrific tiny oscillating fan for circulating the air in a grow tent canopy. Purchase two Hurricane fans for a more affordable alternative.

Below the canopy

At $16, the Honeywell Air Circulator Fan is excellent value. Having an extra fan directed below your canopy can assist to keep the air flowing and prevent it from becoming stagnant beneath it. It will also aid in the reduction of moisture accumulation, which can cause difficulties. It is possible that an under-canopy fan in your grow tent arrangement will and can assist in drying up the top layer of coco between feedings, which will lessen the likelihood of fungus gnats or other insects appearing.

Clip fans, as well as air circulator fans, are excellent for use under the canopy.

An overturned bucket is being used to support a table fan, which will direct air flow toward the canopy.

How much air circulation do marijuana plants need?

This will ensure that your plants are continually rustling. Direct the fans directly towards your plants to get this effect. A minimum of once every 5 minutes, the CO2 surrounding your marijuana plants should be replaced to ensure optimal development of marijuana plants. The finest sound is a quiet rustling. However, depending on your configuration, it may be difficult to achieve consistent circulation. Designed for bigger grow tents, the Vornado 460 fan produces tremendous air flow. Make sure that you do not overdo the air circulation.

The amount of air circulation required by your marijuana plants may also vary depending on the lighting you choose.

Once you’ve completed your grow tent fan arrangement, you should try the hand test.

Increasing circulation above the canopy of your plants can help to lessen the amount of heat reaching the tops of your plants.

A clip-on fan is great for positioning a fan in a grow tent so that air is directed at the top of your plants’ canopy, rather than at the bottom.

What sizes and types of fans work best in grow tents

When it comes to selecting the best fan for your grow tent, there are several factors to consider. It is possible to maximize air coverage across a large area in a large grow room by employing circulation fans with oscillation. The use of clip-on fans attached to a pole in a small grow tent is preferable because it allows for more air circulation. To learn more about choosing grow tent fans, check out ourgrow tent fan reviewpage.

Clip on fans

The most often used clip fans in grow tents are 6 inches and 8 inches in diameter. Opt for a bigger size, but bear in mind that this is a measurement of the total grill size, not of the length of the fan blades. Clips fans put on tent poles can only be rotated in a limited number of directions; your available angles are restricted since the material itself will get in the way of the clip’s form and prohibit you from spinning it completely. In a grow tent, using numerous clip fans to circulate air above the canopy is a perfect option for above-canopy circulation.

Despite the fact that they do not circulate a lot of air, they are effective in a small to medium grow tent and are also a wonderful method to conserve room in a larger grow tent.

Best small oscillating fan for grow tent use

We’ve narrowed down our choices to two: the Honeywell Little Oscillating Fan ($36) and the Secret Jardin Oscillating Monkey Fan ($46), both of which are excellent small oscillating fans for grow tents. It would be necessary to place the Honeywell model on the floor, but the Secret Jardin Oscillating Monkey Fan has a specific hook that is designed to accommodate tent poles. A tiny oscillating fan for use in a grow tent is ideal for tent sizes such as 4×4, 5×5, 3×3, and 2×4 (and smaller).

Small Air Circulator Fans

Small air circulator fans are ideal for putting on the floor of a grow tent to circulate air. Fans ranging in size from 6′′ to 12′′ are ideal. Some types oscillate, however for most grow tents of reasonable size, you may just position it across the floor to ensure appropriate air circulation without oscillating. These fans are an excellent low-cost option for those that want a lot of power. Please ensure that you do not aim high-speed fans straight onto surrounding plants in order to minimize wind damage.

Large Oscillating fans

Large grow tents necessitate the use of a larger solution. Oscillating fans are available in a variety of sizes, including 8′′, 10′′, 12′′, 16′′, 20′′, 24′′, and 30′′. The vast majority of the bigger sizes are available as stand fans, as well. The fact that oscillating fans can supply air in numerous directions makes them an excellent choice for ensuring that there is plenty of air circulation around your marijuana plants. If you have the space, go ahead and do it. Large oscillating fans mounted on platforms perform admirably in large tents with plenty of people.

The 16′′ Lasko 2520 Oscillating Stand Fan ($26) is a low-cost option to circulate air in huge grow rooms or grow tents without breaking the bank.

The 18′′ version is only a few dollars more expensive. Wall-mounted oscillating fans, like as the Lasko 16-inch Wall Mount Fan ($60), are good for installing directly to the walls of your grow room, but they aren’t suitable for tent grows since they are too noisy.

Tower fans for grow tents

Large grow tents necessitate the use of a more substantial system. Oscillating fans are available in a variety of sizes, including 8-inch, 10-inch, 12-inch, 16-inch, 20-inch, 24-inch, and 30-inch models. Larger fans are available in a variety of sizes, including stand fans. The fact that oscillating fans can supply air in numerous directions makes them an excellent choice for ensuring that there is plenty of air circulation around your cannabis plants. It’s okay if you don’t have enough space.

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Multiple fans are required in larger grow rooms or tent setups, but the odds are that if you’re using a really large grow tent, you aren’t reading this lesson on grow tent fans anyhow.

For a few dollars extra, you can have the 18-inch display.

Under the canopy circulation

Clip fans may also be utilized to circulate air beneath the canopy, which will help to keep the area cool. High-velocity floor fan models are even better because they are available in bigger sizes and can circulate far more air than standard versions. They are available in both small and big sizes. Fans with variable fan speeds are preferable since they allow you to fine-tune the circulation based on your configuration. It’s even possible to rig up a medium-sized desk fan below your tent, depending on how much space you have on the margins of your tent’s perimeter.

How many fans does your grow tent need?

Two fans are sufficient for medium-sized tents, such as 44. You may use a single clip fan on the canopy’s roof and a medium floor fan on the ground below it. Using this method, all four plants in a 44 grow tent will hear a slight ruffle. When using a 55 foot tent or bigger, installing a second clip fan on the other side of the canopy will provide better coverage and air circulation. You can use one of the floor fans in the basement. When it comes to really tight spaces, such as a tent or a closet for mother plants, a single modest fan will do the task well.

Safely installing fans in grow tents

When it comes to midsize tents, two fans are perfect. Using a single clip fan over the canopy and a medium floor fan below, you can keep the temperature comfortable. When all four plants are grown in a 44 grow tent, the result will be a pleasant rustling sound. When using a 55 foot tent or bigger, putting a second clip fan on the other side of the canopy will provide more coverage and reduce wind resistance. A single floor fan may be operated from below.

One little fan would be sufficient for a very small room such as an outdoor tent or a closet dedicated to mother plants. A single fan would generally suffice for a 3×3 grow tent or smaller, however two fans running at moderate speeds are preferable in this case.


When it comes to preparing for optimum air circulation in marijuana grow tents and grow rooms, there are several aspects to take into account. Grow tent fans should be installed in such a way that your tent does not generate pockets of stagnant air or pockets of excessive humidity. If you follow these procedures, you will aid in the creation of optimal growth conditions for your plants, and you will be rewarded with an abundance of dank, high-quality buds that are rich in THC content and potency.

Description Learn about the different sizes and types of fans that are required for adequate air circulation in marijuana grow tents in order to promote healthy weed plant development.

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What Size Fan Do I Need For My Grow Tent? (With Handy Table For Common Sizes)

First and foremost, the bad news. It’s possible that you’ll have to conduct some math. The good news is that It’s a simple piece of mathematics. And we’ll take you step by step through the process. In addition, we’ll provide you with a useful table that lists the most typical grow tent sizes and configurations. Chances are you will be able to find your information in the table and will not have to perform any calculations.

What Size Fan Do I Need For My Grow Tent?

It is not the size of the fan that is crucial. It refers to the capacity of the fan. First and foremost, you must determine the amount of capacity you require. The capacity, in turn, dictates the size of the fan. For the majority of home gardeners, a 4 or 6 inch fan would suffice. How do we determine the amount of fan capacity you require for your grow tent’s fan? By following the steps in the computation we’ll go through later. Alternatively, you might scroll down to our table and see whether your tent size is listed there as an option.

Calculating Base Fan Requirement For Your Grow Tent

Obtaining the overall volume of your grow tent is the first piece of information you’ll need. To obtain this, simply multiply the width by the length by the height (width times length times height). For the sake of this computation, we are using feet rather than cubic feet per minute since fan capacity are measured in cubic feet per minute in the United States. It makes no difference whether or not you utilize meters in your calculations. Consider the following scenario: you have a 5 by 5 foot grow tent with a height of 78 inches, or 6.5 feet.

  1. The total volume is equal to 5 x 6.5 = 162.5 ft3.
  2. The capacity of a fan is measured in cubic feet per minute (cfm), which is an abbreviation for cubic feet per minute.
  3. For the most part, we recommend that you strive to refill the air in the tent once per minute.
  4. Using this formula, divide the entire grow tent volume by two or three to obtain the base fan capacity you want.
  5. Not so fast, my friend.
  6. If you simply have one fan extracting air and nothing else, the capacity we offer is the minimum amount required.

However, there are likely to be a number of additional components in your arrangement that decrease the fan’s capacity to circulate air. In addition, there are variables that raise the capacity requirements. As a result, we must make certain modifications.

Adjusting For Ducting, Filters, Lights, Etc.

Components such as ducting and filters all contribute to a reduction in the capacity of your fan. You must take this into consideration in your calculations and purchase a fan with greater power to compensate for the drop in airflow. Other components, such as lighting, can enhance your cooling requirements. You’ll need to build in some extra capacity to accommodate them. If your tent is going to be in a hot environment, you should also include some extra capacity. Here are some of the most typical components and considerations to consider, as well as the impact of the additional capacity you’ll wish to add, expressed as a % increase in capacity.

  • Lights: a 10% rise for each additional grow light
  • Filters: a 25% increase for each additional filter
  • Ducting: a 1% increase for each additional foot of ducting
  • Bending of ducting: 30 percent for every 90-degree bend (15 percent for every 45-degree bend)
  • External heat: If your grow tent is located in a warmer area (e.g., the attic or a sunny room) and/or is not adequately insulated from the external environment, the temperature will rise by 10%.

Add together all of the percentage increases to obtain the overall % increase. Consider the following scenario: we have a single grow lamp, one filter, and 6 feet of ducting with one 90-degree curve. However, the tent is not situated in an exceptionally hot environment. Growth lights add 10% to the total percentage increase, which is 25 percent to the filter and 36 percent to the ducting and bend. The total percentage increase is 71 percent. Then you’ll want to convert this percentage to a decimal and multiply it by one hundred.

  • A 44 percent rise would result in a 1.44 percent gain.
  • As a result, a 125 percent rise would result in a 2.25 percent increase.
  • As a result, 5 percent would be 1.05 percent (and not 1.5, which is a 50 percent increase).
  • In our example, that was 162.5 cubic feet per minute.
  • In our case, the required capacity is 162.5 cfm multiplied by 1.71 to equal 277.875 cfm.
  • However, it is typically a good idea to get a fan that has around 25% greater capacity than you actually require.

Get A Fan With More Capacity Than Required

We strongly advise you to get a fan with a larger capacity than you require. Running fans at full capacity puts greater strain on them, which means they will not last as long as they should. It also causes them to become louder. When you run a fan at a lower speed than its maximum speed, it will last longer and operate more silently. It also provides the ability to expand capacity in the event that your cooling requirements develop in the future. Nothing can be predicted; a heat wave, for instance, may occur.

Adding 25 percent to our previous example works in the same way as before: increase the capacity by 1.25 times the percentage.

Make a rounding error and purchase the next largest capacity fan of the type you desire. In this scenario, the 6 inch version of the fan we offer in the next section would most likely be the best option. It has a capacity of 402 cubic feet per minute.

What Is A Good Fan To Get?

There are many various types of fans available on the market, and the most of them will perform admirably. In general, the more money you spend, the higher the quality of the product or service you receive. This typically indicates that the fan operates at a lower noise level, is more efficient (has a larger capacity per watts consumed), and has a longer lifespan. Our favorite fans are the AC Infinity Cloudline fans. They are neither the most affordable nor the greatest quality. However, they are the most cost-effective option.

The 4 inch fan has a capacity of 205 cfm, the 6 inch has a capacity of 402 cfm, and the 8 inch has a capacity of 807 cfm.

This would necessitate the purchase of a number of fans.

Table Of Fan Requirements For Common Grow Tent Sizes

The fan power (in cubic feet per minute) required for various grow tent sizes is shown in the following table. It is not an issue if the height of your tent is somewhat different from the standard height. The capacity that has been provided will still be adequate for your needs. In the same way, if you have a few additional feet of ducting (or a few extra feet less), you may still utilize the closest circumstance in the table to get the job done. Because you should be purchasing a fan that can handle around 25% more airflow than your requirements, you should have some wiggle space if you find yourself in need of a little extra power later on.

  • That implies one light for everything up to and including the 55, two lights for the 48 and 510, and four lights for the two biggest sizes, respectively.
  • That means the cfm value you are given is your final number, and it is this number that you should search for in a fan while shopping.
  • We suggest their 6 inch fan for anything that requires less than 402 cfm.
  • If your tent’s airflow requirements exceed 807 cfm, you’ll need to install many fans in it.

Do I Need An Intake Fan?

In most cases, an intake fan will not be required for tiny tents. If you have a sufficient number of intake vents or if they are of sufficient size, having only intake vents may be sufficient. Generally speaking, opening intakes should be three to four times the total size of the outtake vents, according to the rule of thumb (s). You might have one enormous intake aperture or three smaller ones that are each as large as the outflow opening, depending on your needs and preferences. If your tent does not have enough, or openings that are large enough, you will need an intake fan to keep the air flowing.

It has the potential to have around 25% less power.

It goes without saying that any ducting and bends in the ducting that are linked to the intake fan should be taken into consideration as well.

In the case of 5 feet of ducting with one 90-degree bend linked to the intake fan, you need to increase its capacity by 30% (25 percent for the bend and 5 percent for the ducting length), therefore you multiply by 1.3 to get the required increase in capacity.

As previously said, it is preferable to choose a fan with a capacity that is 25 percent greater than what you actually require.

What Size Carbon Filter Do I Need?

When purchasing a carbon filter, there are basically just two considerations to keep in mind. The first is that the flange size must correspond to the fan size. If you purchase a 4 inch fan, be certain that you also get a 4 inch filter. Second, ensure that the filter’s capacity (also measured in cubic feet per minute) is equal to or greater than the fan’s capacity. It is recommended that you get filters from the same manufacturer as your fans. For example, if you choose the AC Infinity fans that we propose, they will come with matching filters as well.

Where To Place Fans And Filters

You have a great deal of latitude in this situation. The first option you must make is whether to place both the fan and the filter inside or outside of the tent, depending on your preference. It is also possible to have one inside and one outdoors. Inside is normally less difficult, but it may not be a choice if you do not have the necessary room. If you’re thinking about placing your grow tent outside, check out ” Carbon Filter Outside Grow Tent “. The fan and filter should be placed at the very top of the tent if they are being used within the enclosure.

In order to pull in colder air, the intake vents (or fans, if you want to use them) should be situated toward the bottom of the enclosure.

Fan Size For Grow Tent: Final Thoughts

Calculating the proper fan size for your grow tent may appear to be a difficult task, but it does not have to be. In following the guidelines we provided above, you will end up with a fan that is capable of successfully removing any surplus heat from your tent, regardless of whether you have a large grow tent or a little grow tent setup. Most likely, the size of your tent was already included in our table, and you were able to avoid having to perform the calculation. It wasn’t that tough, even if you had to perform the arithmetic (or even if you simply ran through it in your head), since it wasn’t that complicated.

Grow Tent Fans – Sizes, Placement, Setup, FAQ (Updated 2022)

It is critical to have adequate circulation in your grow tent if you want to avoid mold and powdery mildew from forming on your cannabis. Throughout this article, I’ll cover all you need to know about choosing an inline fan for your grow tent and how to correctly install and configure it as well. How to choose the right grow tent fan size and power rating, where to install the fan, how to set up your grow tent fan, and what additional accessories you’ll need are all things I’ll assist you with.

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Selecting the proper grow tent fan size and power:

“What is the right grow tent fan size?” is definitely one of the first questions you’re thinking about. as well as “What is the recommended grow tent fan power?” Generally speaking, when it comes to replenishing air in a grow room, the rule of thumb is that you should be able to replace all of the air once each minute. That is the CFM rating, which you will learn more about further down. In order to keep your grow tent cool, the fan diameter will be decided by the CFM (cubic feet per minute) rating that you want.

So don’t be concerned about having the correct CFM rate.

Then there are a few other factors, such as a 25 percent drop in fan power if you include a carbon filter, and a 30 percent loss in fan power for each 90-degree curve in your ducting.

The proper size fan for a 4×4 grow tent:

Let me give you an example of how to calculate the area of a 4×4 grow tent, which is a fairly typical size among indoor growers: The majority of 4×4 tents have dimensions of 48 in x 48 in x 80 in. As a result, the total volume of air in a 4×4 grow tent is 4ft (length) x 4ft (width) x 6.667ft (height) = 106.67 cubic feet (4ft (length) x 6.667ft (height). However, this does not imply that you require a 106 cfm fan. When you consider that a carbon filter will lower your fan efficiency by 25 percent, and that one 90 degree duct bend would reduce your fan efficiency by another 30 percent, a fan that produces 215cfm will produce 112cfm (200cfm x 0.7 x 0.75).

What size fan is needed for other grow tent sizes?

(Click on image to expand) It is important to note that grow tent inline fans are not made to the precise CFM output you want, thus you may have to go over by 50-100cfm when selecting a fan for your grow tent. I recommend using a fan with variable speed settings, such as the AC Infinity S or T Series, so that you may modify the CFM to meet your precise requirements. Each of the AC Infinity fans listed below has ten speed options, so if you just want 100cfm, you may get the most basic model, which is a 205cfm fan, and run it on the middle speed level to achieve that volume of air.

Grow tent fan placement:

Depending on where you want your grow tent fan to be, you have two alternatives. It is possible to work either inside or outside the grow tent. What’s the difference between the two? If you pick outdoors, the fan will draw air from the interior of your tent to the outside through a duct located on the top corner of your tent, allowing you to be more comfortable. You’ll want the fan and filter (if you’re using one) hanging near the top portion of the tent, where the warmest air will naturally travel to keep it cool inside.

Hangers are not often included with fans, so double-check that you have them.

If you decide to place the fan outside, you’ll need to figure out how to get it to rest in a comfortable position.

Because of the fan’s ability to produce a low pressure condition within the tent, when air is blasted out, new air is naturally drawn into the tent.

Grow tent fan setup:

Yes, the diameters of your inline fan and duct will need to be the same at the place where they connect.

Passive or Active Air Flow For Your Grow Tent?

The sorts of fan sets you may utilize in your grow tent or growing room are passive and active. Passive fans are the most common. The difference is whether you want air to passively re-enter your grow tent or if you want it to aggressively re-enter your grow tent. Passive grow tent air circulation relies on a single inline fan to evacuate hot air from your grow room, reducing the need for additional fans. When air is forced out of your enclosed grow area, the pressure in the room drops to a negative pressure, which means that air from outside the tent or room should naturally be drawn in via any openings to replace the air that has been forced out of the space.

  1. If you want to guarantee that the air returning to the tent is being filtered, or if the air returning to the tent is not returning rapidly enough, active grow tent air replacement is the best option for you.
  2. Simply ensure that you have the right size ducting (which should be the same diameter as your fan), duct clamps, hangers for hanging, and zip ties before beginning (make sure zip ties are long enough to go around the diameter of your carbon filter).
  3. To install the filter, just attach ducting to the side of your fan that is responsible for sucking in air.
  4. Clamps should be used on both sides (usually provided).

If you’re using an active air flow configuration, I’d recommend operating both fans at the same speed to ensure that the quantity of air escaping the grow tent equals the amount of air returning to the grow tent.

How to install a grow tent fancarbon filter inside your tent:

Attach the hangers to the support bars that run along the roof of your grow tent. You’ll need enough for the fan and the ducting, so plan accordingly. Make sure they’re the right length for the fan you’ll be hanging. Keep in mind that heated air rises to the top of the tent, so avoid hanging the tent too low. 2.Attach zip ties or metal brackets to the attachment area of your grow tent fan: Place zip ties or metal brackets to the attachment region of your grow tent fan. Zip ties should be used to connect hangers.

In order to use your grow tent fan, you must first connect your carbon filter to the intake side of the fan (the side that sucks air in).

You may either connect it directly to the fan or use ducting to attach it to the fan.

Attach the grow tent duct sleeve to the fan ducting by wrapping it securely around it.

Other Inline Fan Installation Notes:

The setup is straightforward; it took me no more than 30 minutes to complete my AC Infinity T4 installation. The most efficient design would be to route the duct out a window so that the hot air from your tent does not just blow into the room where your tent is placed, where it would be sucked back in and render the entire operation ineffective. Not everyone has the benefit of having a window in close proximity to their camping site. In that case, if you’re compelled to blow tent air into the same room where the tent is placed, I highly recommend investing in a portable air conditioner to re-cool the air before sucking it back into the tent through the bottom tent windows.

Does It Matter What Carbon Filter I Choose For My Grow Tent Fan?

When selecting a carbon filter for your grow tent fan, the one thing you want to be certain of is that the diameter of the connection point on the fan and the filter are the same. Make certain that your inline fan is equipped with a four inch carbon filter if your fan is four inches in diameter. Apart from that, there isn’t much of a difference between carbon filters; they’re simply large metal canisters that filter your air through charcoal to remove impurities and odors from it.

Do I Need an Oscillating Fan in Addition to my Inline Fan?

Even though the inline fan removes and replaces the air in your grow tent, it performs a poor job of circulating the air. As a result, you should think about including an oscillating fan in your grow tent to keep the air circulating and prevent mold and mildew spores from taking root. It’ll also assist distribute around fresh air for the plants to absorb. There are little affordable oscillating fans that you can attach into the grow tent poles if you have a look at the fans I’ve listed below.

Which Grow Tent Fans I Recommend:

As long as you’re willing to purchase the ducts and hangers separately from the fans, AC Infinity offers fantastic grow tent fans. Purchasing the ducts and hangers is simple – simply match the duct diameter to the fan diameter. What is it about the AC Infinity fans that makes them so much superior than the competition? This fan is equipped with a programmable controller, which allows the fan to switch on in response to a range of different scenarios. For example, you may program the fan to turn on when the humidity reaches a given threshold.

  • You may also set a timer and receive alarm notifications.
  • When my AC Infinity T4 was running at maximum power, I was pleasantly pleased at how quiet it was.
  • This results in the fan motors being loud.
  • Quiet Inline Duct Fans With Temperature and Humidity Control – CLOUDLINE SERIES Them fans are priced similarly to other fans without the technological characteristics, therefore it makes financial sense to purchase one of these instead of another fan.

The fans are available in three sizes: 205cfm, 351cfm, and 750cfm (4-inch, 6-inch, and 8-inch). Click here to see whether they are available on Amazon.

VivoHome Inline Fan Kit

If you don’t want to go through the trouble of sourcing all of the components separately, this kit includes a fan, 8 feet of ducting, clamps, hangers, and a carbon filter. It is available in two different sizes to accommodate different grow tent sizes. With this kit, the main drawback is that the fan cannot be programmed to come on when particular conditions are fulfilled, such as a certain temperature or humidity. The fan has a simple on/off switch. Despite the fact that some customers have stated that they are content with the fan running all of the time.

Secret Jardin Clip On Monkey Fan for Grow Tents:

Secret Jardin created this 6-inch clip-on oscillating fan with a grow tent owner in mind when they created this product. The clip is designed to attach securely on the support poles of grow tents. The fan will ensure that your grow tent has adequate air circulation, which is necessary to avoid the growth of mold and powdery mildew. I’d recommend using one of these oscillating clip fans in conjunction with an inline fan in order to maintain the ideal growth environment in your grow tent.

Keeping Your Grow Tent Cool

When it comes to keeping your grow tent temps under control, you may want more than simply an inline fan. My best recommendation, without requiring you to read the entire post, is to consider purchasing a portable air conditioner for the room in which your tent is placed, or to consider adding CO2 to your growing environment, which allows you to grow a few degrees hotter than usual. See my whole post on decreasing grow tent temps for more information.

Ideal Grow Tent Temperature and Humidity for Growing Cannabis:

The optimal temperature for cannabis plants is between 70 and 80 degrees Fahrenheit (23 degrees Celsius). Consequently, consider yourself fortunate if you have a modest grow light in a small tent, or other circumstances that allow you to maintain those temps without using an inline fan. During the seedling and vegetative stages of the cannabis plant’s life cycle, 60 percent to 70 percent humidity is ideal. When cannabis plants are in the blooming stage, they grow best when the humidity is between 40 and 60 percent.

As your plants mature, they will begin to use a significant percentage of the CO2 that is available in your growing environment.

Other Resources for Growing Cannabis Indoors:

I developed numerous useful lists and tips to assist you in completing your home improvement project the right way, in addition to determining the proper fan size for your needs. The following are some other articles I strongly recommend: Choosing the Proper Size Grow Tent, This Year’s Best LED Grow Light List, and Understanding Grow Light PAR PPFD and Wattage, among others. Last but not least, don’t forget to check out myhome page for a comprehensive collection of useful resources.

Grow Tent FanCarbon Filter FAQ:

You’ll just need 30-45 minutes to complete this task.

What should I do if there isn’t a CFM output for my exact grow tent size?

The AC Infinity fans feature a number of different speed settings to choose from.

As a result, if you just want 100cfm, you may get the 205cfm (smallest model) and utilize the middle of the ten available speed settings.

If I’m buying parts separately, how do I know if they’ll all fit together?

The diameter of all of these components is the same. If you purchase a 6′′ fan, be sure you also purchase 6′′ ducting and a 6′′ filter to complete the installation. That’s all there is to it, really.

Do I need to hang the carbon filter?

The carbon filter should be placed at the top of your tent in order to capture the warmest air because it is where air will reach your fan from the outside. It would be inefficient to hang the filter low or to place it on the floor, for example.

Which end of the grow tent fan do I connect the carbon filter?

Connect the carbon filter to the “front” of the fan, which means that the fan is sucking air through the filter rather than expelling air through it, and that the fan is running continuously.

What size fan will fit in my grow tent?

Most grow tents accommodate 8-inch ducting, while some may only accommodate 6-inch ducting.

What if the size of my duct is too big for the duct hole on my grow tent?

If your grow tent outlet is 6 inches in diameter and your ducting is 8 inches in diameter, you’ll need to purchase a ducting reducer.

There’s too much negative pressure in my grow tent

Ducting reducers are required when using 8-inch ducting for a grow tent outlet that is 6-inch in size.

Can you wash or clean carbon filters after extended use?

It is possible to clean a carbon filter using compressed air. The filter may be used for up to one year before it has to be cleaned.

Can you place a carbon filter on each side of your fan?

Using pressured air, you can clean a carbon filter.’ Prior to needing to be cleaned, the filter can be used for up to a year.

Do all carbon filters come with pre-filter wrap for the exterior of the canister?

Pre-filter wrap is not included with all carbon filters; thus, if you want a pre-filter included, be sure to check the product page specifics before purchasing.

What’s the largest outer dimension of my carbon filter?

Increase the output size by approximately 2 inches. On a 4 inch carbon filter, the canister diameter would be approximately 6 inches in diameter.

How long do carbon filters last?

Carbon filters are designed to endure for at least one year of continuous usage.

Do I need inline and oscillating fans in my grow tent?

Inline and oscillating fans serve various functions in the grow tent, so it’s a good idea to use both if you have the option.

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