Where To Place Fans In Grow Tent

Air Circulation…8 Ways to Use Your Fans – Expert Advice

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Air Circulation… 9 Ways to Use Your Fans

Make good use of them, and your air circulation fans will quickly become your new best friends. They are inexpensive, yet they have a significant influence on your climate. Learn how to get the most out of yours by following these steps: Air circulation fans circulate the air continually, preventing the formation of microclimates – in which the temperature, humidity, and CO2 levels fluctuate throughout your growing space.

  • Mold is less likely to grow in hot, humid environments. Provides a consistent temperature, humidity, and CO2 level

Additional to this, air circulation fans strengthen plants by providing an artificial breeze to help them grow stronger. This simulates outside circumstances, which include:

  • As the wind blows gently over the plant’s stems and leaves, the plants get stronger over time.

1. Mix Your Air (ideally with a DiffuseAir)

Even though all air circulating fans mix the air, some are more effective than others. ADiffuseAiris without a doubt the most convenient to use. This allows them to mix air without producing any sharp air streams that might cause windburn. There are two methods of employing them:

  • In your grow chamber, circulate the air: Make a connection with RVK and suspend it. Assemble an RVK intake fan and use it to evenly spread the intake air.

In any case, you’ll have more floor space.

2. Point your air circulators towards a wall or ceiling

Avoid directing them directly towards plants, since this might cause them to dry out and/or suffer from windburn. If you have a DiffuseAir, this isn’t a problem at all. Put it in the center of a square tent and you’re done! (use multiples in larger areas). If you have any other type of fan, be extremely cautious to set it on the floor and direct the air upwards in order to guarantee that the temperatures at the top and bottom of your growing space are more evenly distributed.

3. Now and again, move your air circulator fans about

Unless you have a DiffuseAir, it’s doubtful that the first place you place your fans will be completely faultless, if at all. You should rehome them on a regular basis to ensure total coverage. Without proper ventilation, you will end up with areas of static electricity that may become problematic over time.

4. Don’t think bigger is better

A large air circulation fan may appear to circulate more air than a smaller one, and you would be correct in this assumption. This isn’t entirely accurate. It is possible that a large oscillating fan will not be able to reach all sections of your grow space. Create continual air flow throughout your growing environment by using a variety of tiny auxiliary fans.

5. Use clip-on fans to reach nookscrannies

Every grow room has a nook or crannie that is difficult to navigate. You’ll most likely notice that certain regions of your grow room are hotter and more humid than the rest of the space. The remedy is straightforward: just use a 6 Inch Clip-On Fan or an 8 Inch Clip-On Fan. They’ll be able to fit almost anywhere. They’re also useful for cooling lights and tanks on a localized basis.

6. Prevent bud rot in flowering

You might acquire botrytis if the humidity in your environment is too high during blossoming (bud rot). In order to keep the air circulating about your fruits and flowers, air circulator fans should be used.

This will assist to prevent situations that lead to bud rot. Utilize an Accuread Temperature and Humidity Meter to keep a careful eye on the surrounding environment. If the relative humidity begins to rise or fall, make adjustments to your fan settings.

7. Use them to cool your nutrient chiller

Some grow room equipment, like as nutrient chillers, generates heat while they operate. You may focus your fan straight at them in order to keep them cool and maximize your performance in the process.

8. Direct humidifier mist over the plant canopy

If you’re using a humidifier, you’ll want to make sure that the humidity is distributed evenly throughout your growing space. Direct the mist flowing out of your humidifier into the path of an air mixing fan. This will guarantee that the humidifying impact is consistent throughout your growth environment.

9. Run fans 24/7 to prevent problems

When the lights are turned off, your relative humidity naturally begins to rise, and you may see some condensation on your plants or canvas as a result. The possibility of bud rot and powdery mildew is increased when this occurs. Keep air circulator fans running all of the time to avoid excessive moisture from accumulating. We hope you have found these suggestions to be beneficial. For further information, you may ask a question in store, start a live chat, or phone 0333 003 22 96. Paul About the authorPaul is the shop manager for our Merton location.

Call GroWell Merton at (020 8648 6327) for further information.

How to Ventilate Your Grow Space

You must have adequate ventilation in order for your plants to flourish. By giving your plants with fresh air from outside your grow tent, you are supplying them with CO2, which is necessary for their photosynthesis. Meanwhile, removing the air inside will help to keep the temperature and moisture buildup under control, avoiding mold and mildew from growing on your plants’ leaves and so hindering their ability to thrive. The extra benefit of refreshing the air within is that it helps to eliminate unpleasant smells.

Essential Grow Tent Parts

Assuming you have previously chosen or purchased your grow tent, this tutorial is equally useful if you are working in a grow room. This is a list of the three most important components that you’ll need to put together while building a ventilation system:

Inline Duct Fan (Active Exhaust Fan)

An inline duct fan, also known as an extractor fan, is a device that is used to exhaust hot and humid air from within a growing chamber or tent. Even little variations in temperature and humidity may have a significant impact on your chances of generating a fruitful harvest. Furthermore, unregulated heat and humidity cause poor growth circumstances, resulting in your plants being unable to absorb water or simply failing to make it through the day. The use of an inline duct fan in your grow room is essential for controlling the climate in your growing environment.

Using an active exhaust fan to draw in cooler air can assist you in maintaining a comfortable inside temperature level.

In ventilation systems with passive intake, inline duct fans also serve as a vacuum, drawing in new CO2 from the outside air and bringing it into the system.

Duct Tubes

Inline duct fans are attached to your grow room using ducting that is clamped or glued in place. The ducting serves as a channel to divert stagnant air away from your grow space. They are typically constructed of aluminum, although they may also be multilayered to provide additional protection against rips. Its size and bends have an impact on the performance of your inline duct fan, but we’ll get into that later.

Carbon Filter

A carbon filter will be required in order to prevent scents from traveling to your garage or closet. This device, which is also known as a carbon scrubber, removes the smell of plants from the air, capturing the odor and neutralizing it. Carbon filters are a must-have for growers that have to cope with very strong odors. They are also used to trap pollen and spores, which helps to keep the air clean for farmers who suffer from allergies or respiratory problems such as asthma.

Typical Grow Tent Setups

There are several configurations for these components that may be used to create airflow into your grow environment. As a standard configuration, the fan and the filter are placed inside, which makes it easy to control while also dampening the noise from the fan. If air is being drawn out of your grow room, one or both of these components can be placed in any sequence within the ventilation chain. It is possible to customize your ventilation system in at least four different ways in order to meet your requirements.

The fan and/or filter can be placed outside of the grow tent in this situation.

Because heat rises to the top of the building, venting that hot air at that point will improve the efficiency of the ventilation process.

What Size Inline Fan do I Need?

There are many different sizes of grow areas, and each one requires a particular amount of airflow to be properly ventilated. It is critical for maximum plant growth that stale air within your grow room is exchanged with fresh air from the outside of your grow area. CFM (cubic feet per minute) is the unit of measurement for this number. To determine the quantity of airflow required for your grow room, first calculate the volume in cubic feet of the space. Most grow tent specifications are offered to you in inches; thus, you must convert the size of your space from inches to feet.

This will match the capacity of your grow room, and the needed airflow will be equal to this value in cubic feet per minute, or CFM, as well.

When the dimensions are added together, the result is 72 ft 3 in length.

Because the volume of a grow area is equal to the amount of CFM necessary to air it per minute, the base CFM for this grow tent is 72. Keep this amount handy since you’ll need to adjust it to account for the ducting, carbon filter, and any other accessories you decide to install.

Factoring in Accessories

In order to boost your base CFM, you must multiply it by the efficiency percentages of your accessories. Adding components to your grow room, including as ducting and carbon filters, may limit fan performance, which will have an impact on the fan size you require. When it comes to ducting, the quantity and sharpness of its bends play a role in determining the resistance to airflow. As a result, airflow decreases the longer it needs go, making a straighter ducting path more effective. The greater the sharpness of the curve, the greater the severity of the efficiency drop; a 30° bend reduces airflow by 20%, while a 90° bend reduces airflow by 60%!

  • If you are utilizing LED grow lights, you must also take into consideration their heat production, which can raise your necessary CFM by as much as 50%.
  • Because the efficiency of accessories on the market might vary substantially, you can utilize approximated efficiency percentages based on the type of component you are using.
  • This amount is multiplied by the efficiency % of each component to arrive at the final result.
  • Adding in the heat output of your grow lamp (about 50%) gives us a needed CFM of 249 cubic feet per minute.
  • The following is a breakdown of this calculation: Multiplying your base CFM (72) by the percentages of ducting (20 percent), carbon filter (60 percent), silencer (20 percent), and grow light heat (50 percent) of your choosing will provide about the 249 CFM you require.
  • This will let the fan to operate at lower speeds while remaining quieter, as well as providing additional area for future expand space system growth.
  • PWM-controlled EC motors are also acceptable in terms of acoustic performance.

How to Manage Grow Space Noise

There is no question that you will hear some noise when employing a high-powered fan to air your grow environment. You wouldn’t want to spend an extended period of time in an area with excessive noise pollution or catch the attention of your neighbors. Fortunately, you can plan your component selection with noise reduction in mind, and you can take further steps to make your grow area as as quiet as possible. Making the decision to choose a fan with speed controls and a CFM rating that is 25 percent more than your minimal need will allow you to run the fan at lower speeds without compromising performance.

If you want to further muffle the sound of your active exhaust fan, you may attach a silencer to it, which will lessen the sound of the intake fan. You may also choose to use insulated ducting instead of regular ducting to lessen the whooshing wind noise that occurs during the installation.

Grow Room Ventilation 101

Indoor growers benefit from an extended growing season, total control over growth conditions, and the convenience of growing in a controlled environment within their home. This all sounds wonderful, but we tend to overlook the need of grow room ventilation. When I initially started growing plants inside, I ran across a lot of difficulties. I had a fan put up, which I though was adequate for providing air circulation for my plants. I was wrong. I was completely mistaken. More than just a corner fan is required to provide proper grow room ventilation.

  • What is the purpose of ventilation in grow rooms? How to properly ventilate a grow room
  • What is the best way to determine what type of fan to purchase?

Don’t get too worked up over it. I’ve made all of these errors (and many more) so that you don’t have to do them yourself. As long as you understand the principles of grow room ventilation, it is actually rather straightforward. So let’s get this party started. Listen to this episode of the Epic Gardening Podcast to learn more about it. Subscribe to the Epic Gardening Podcast on iTunes to get the latest episodes.

See also:  How To Make A Tent In Your Room

Why Do You Need to Ventilate Your Grow Room?

So, why is it necessary to have ventilation in grow rooms and grow tents? As it turns out, there are a slew of factors to consider. Light breezes, sunlight, evaporation, and precipitation all have a calming impact on plants that are planted outside in the open air. Inside, we replace fans for the wind and evaporation caused by the sun, grow lights for the sunlight, and irrigation systems for the precipitation caused by the rain. What we tend to overlook is that air flows more naturally outside than it does in your grow area.

The reason behind this is as follows.

Remove Excess Heat

Heat is produced by grow lights. It may not seem like much, but even a few degrees variation in temperature may make the difference between a good harvest and a less successful one in agriculture. Certain grow lights generate more heat than others, but all generate enough heat to need the use of a ventilation system.

Control Humidity

It is also possible that humidity will play a role in the development of difficulties with indoor growth systems. Every day, plants release water vapor, which raises the humidity level in your grow room to an unhealthy level. The growth of pests and illnesses can be exacerbated by uncontrolled humidity, which results in poor growing circumstances. A proper ventilation system also wicks away part of the water that is released during transpiration, allowing your plants to absorb more water and suck up nutrients through their root systems, resulting in increased plant growth and productivity.

Prevent Pests and Diseases

Pests and illnesses are less likely to spread when there is enough air movement. Mold, powdery mildew, spider mites, and fungus gnats are all attracted to stagnant, damp environments.

Pests deposit their eggs in moist topsoil, so using a fan to keep the top layer of soil dry will help to limit their reproductive cycle. Additionally, a consistent breeze makes it more difficult for them to establish themselves on your plants in the first place, which is beneficial for you.

Control CO2

There is one extremely important reason why plants require outside air: carbon dioxide (CO2). Carbon dioxide is absorbed by plants throughout the day as part of the nutrition cycle. If your grow tent arrangement is sealed, this implies that the level of CO2 in the room steadily declines, resulting in your plants’ development being stunted over time. When you have good ventilation, you can bring in new air and fresh CO2 from outside and remove the old air from your grow room, which will help you grow more and yield more.

Manage Wind Stress

Wind regularly buffets outside plants, causing them to wilt. This helps to make the stems of the plants stronger, which is beneficial when it comes time for them to yield their fruit. Plants that are stronger produce and grow better than lesser plants, which can get weakened by the weight of their own production. So, why do you require a grow room ventilation system in the first place? Let’s go through it again. A good ventilation system should include the following features:

  • It lowers the likelihood of illnesses such as mold and powdery mildew growing in the home. It might assist you in protecting your plants against pests such as spider mites and fungus gnats. It assists you in maintaining temperature and humidity management in your grow environment. It aids in the strengthening of your plants’ stems.

If those arguments aren’t enough to persuade you that you require a grow room ventilation system, consider the expense. The cost of setting up a grow tent is not inexpensive. If you’re going to spend the money on a grow tent or grow room, you may as well have it done correctly the first time.

How to Ventilate Your Grow Room

As you learn how to ventilate a grow room, bear in mind that your grow room ventilation system will require two different types of fans to function properly. We’ll talk about the air extractor fan system later, but for now, let’s talk about oscillating fans and how they work. These fans are both inexpensive and effective, which are two of my favorite characteristics in a cooling system of any kind. They circulate air continually above, below, and around your plants, which helps to keep the grow room cool and enhance air circulation in the space.

  • You want your oscillating fans to be able to reach all regions of the growing space, which may entail purchasing a number of fans, but you also don’t want them to be able to point directly at your plants.
  • Installing oscillating fans in your grow room will assist in regulating the temperature and humidity in the space, but fans alone will not be sufficient.
  • A very simple ventilation system.
  • It is recommended that your grow room’s extractor fan system replenish the air in your grow room once per minute, or at the very least every three to five minutes.
  • Making the decision to combine grow tent setup with grow tent ventilation setup was one of the finest decisions I’ve ever made in my life.

Take a moment to learn more about grow tent ventilation before you invest your time and money in grow tent setup. The best time to install a ventilation system in your grow tent is during the setup process since you will not have to work around existing plants or make any changes to your system.

Calculating Fan Strength

Calculating the fan strength you want involves a small amount of mathematics, but it is a straightforward process. CFM, or cubic feet per minute, is the unit of measurement for fans. You must know the following information in order to calculate the CFM you require:

  • The size of your grow room or tent
  • The effectiveness of the exhaust system

The size of your grow room or tent; the efficacy of your exhaust system; and other factors. For example, if the volume of your room is 320 cubic feet and you have a short duct, you should multiply this figure by two to get the total volume of your room. After you’ve calculated your CFM, seek for a fan that produces more airflow than this figure. If you’re still not sure what I’m talking about, watch this video.

Passive Intake vs Active Intake

There are two methods for bringing air into your grow room, which are known to as passive intake and active intake, respectively. Passive intake is reliant on passive airflow and negative pressure to function properly. With this grow room ventilation system, you have a fan that blows air out, but there is no fan that blows air into the grow room. Instead, you have an intake hole that allows new air to enter passively as a result of pressure differential between the interior of the room and the outside of the room.

In this way, your fan will not have to work as hard and your ventilation system will be able to accomplish optimum suction.

With the help of a fan, active intake systems actively suck air into your grow room.

As a result, if your intake hole is the same size as your exhaust hole, you may want to consider employing an active intake system instead of a passive intake system instead.

Controlling Humidity

Humidity has a significant impact on the health of plants. Too much humidity in your grow room can cause illness, and too little humidity can have a negative influence on development, therefore we need to keep an eye on the humidity level at all times. The majority of the humidity in the grow room is caused by transpiration. Transpiration is the mechanism through which plants release water into the atmosphere through their leaves. The suction caused by transpiration, similar to that of a straw, draws nutrients up through the roots of the plant as the plant creates water vapor.

  1. You are not only denying them of water, but you are also essentially depriving them of all nutrition as a result of your actions.
  2. As a result, you must be able to easily raise and lower the humidity in your grow room.
  3. All that is required is that the humid air be vented out through an exhaust system, as long as the air coming in from the intake is less humid than the air coming in through the room.
  4. When it comes to growing plants, there are instances when you may need to increase the humidity level.
  5. Consider conducting some study on the humidity levels that your crops enjoy and making every effort to keep the levels within acceptable limits.

Also keep in mind that larger plants emit more water vapor than smaller plants, so as your plants develop, you may need to pay more attention to the humidity levels in the environment.

CO2 Injection

Considering that plants require CO2 for transpiration, it seems reasonable to assume that injecting CO2 into your grow tent will be sufficient to increase plant development. While this is true in theory, there are a few things you should be aware of before using a CO2 injection system in your grow room. CO2 injections need the use of a climate-controlled grow environment for two very essential reasons. The first is a matter of efficiency. Due to the fact that CO2 only works at extremely high concentrations, you’ll need to use a sealed grow room or grow tent arrangement in order to get a concentration high enough to be beneficial.

  1. It is unhealthy for people to breathe in the high quantities of CO2 suggested for plants.
  2. Consider the fact that your plants will benefit from additional CO2 only if they have powerful grow lights, which you should consider before adding more.
  3. So, should you consider adding CO2 to your growing environment?
  4. You must also consider the financial implications.
  5. For those who have some wiggle space in their budget and wish to experiment with enhancing yields through the use of CO2, explore the options and give it a shot.

Grow Room Ventilation FAQ

First, let’s get a few frequently asked questions out of the way before we finish this session. Q. What size and type of fan do I require? Choosing a fan for the ventilation of your grow room is not a straightforward process. There are a plethora of alternatives available. For starters, you’ll need an in-line duct fan with a capacity larger than the predicted CFM of your grow room. Once you’ve determined the fan’s specs, you’ll need to pick a manufacturer and model. Fans are available in a variety of pricing ranges, so be sure to check several product reviews to ensure that you are obtaining the greatest fan for your money.

  1. Q.
  2. The size of your bulb is one criterion that might assist you in narrowing down your fan search.
  3. Because of the size of the light hood’s entrance, you’ll most likely need a fan with a 6-inch diameter at the very least.
  4. Q.
  5. In order to determine how much of a fan you require for your room, you must first calculate the CFM of your room using the method we discussed before.
  6. Additionally, you should invest in some inexpensive oscillating fans to assist you in regulating the temperature and controlling the airflow in your grow area.
  7. What size intake fan do I need for my system?

If you are using a passive intake system, the solution is straightforward.

Select an intake fan that is the same size as your exhaust fan if your system is equipped with an active intake system.

What is negative pressure and how does it work?

As a result of the negative pressure in the room, clean air is drawn in from the outside through your input hole, bringing this concept into play during passive ventilation.

Consider negative pressure to be an excursion under the surface of the water in a plywood box.

Assume that the water coming in represents clean air and that the water escaping in bubbles represents unclean air.



However, insulated aluminum ducting or a heavier-duty duct, depending on your tastes and budget, might be used instead of this because it is more economical and easier to install.

Smaller ducts, as well as more bends in the duct and the length of the duct, all contribute to increased airflow resistance, as airflow decreases the longer it has go in a duct.

What can I do to enhance the efficiency of my ducting?

The first thing you should do if you have flexible aluminum ducting is to smooth out any creases that have formed.

Increased airflow and improved performance of your ducting will result as a result of this modification. You may also try to reroute the duct so that it makes fewer turns along the way, and minimize the length of the duct system if at all feasible.

Go Forth and Ventilate!

I sincerely hope you found this article on grow room ventilation systems to be informative. Achieving the optimal ventilation system for your grow room may be difficult, which is why I believe it is critical for indoor growers to understand how ventilation systems function and how grow room ventilation systems can assist their operations. Once you understand the fundamentals, you will be in a much better position to select the most appropriate solution for your organization. How about you? Do you have a grow room ventilation system you adore?

See also:  How To Make Tent For Child At Home

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Where to put oscillating fan in grow tent?

Dora Tremblay posed the question. Score: 4.7 out of 5 (48 votes) Put it in the center of a square tent and you’re done! (use multiples in larger areas). If you have any other type of fan, be extremely cautious to set it on the floor and direct the air upwards in order to guarantee that the temperatures at the top and bottom of your growing space are more evenly distributed.

Where should grow tent fans be placed?

In general, we recommend that you put your extractor fan and all other components of your exhaust system within your grow tent in order to reduce noise contamination. But if you’re running out of room or having trouble keeping the heat under control inside your tent, feel free to set up your fan outside of the tent.

Should I run my fan 24/7 In my grow tent?

Flowering is the most critical stage of the entire growth process, and this is especially true for cannabis cultivators. During daylight hours, both exhaust and oscillation fans should be functioning, as they should always be. As a result, the ideal approach is to have scrubber fans running 24 hours a day, seven days a week throughout late blooming stage.

Does Grow tent need intake fan?

Passive air intake may be used in larger grow tents as well, although larger grow tents would necessitate larger exhaust fans with greater CFM ratings. The intake of fresh air is simply one component of the indoor growth equation. Many parameters, including as the size of the grow tent, the number of grow lights, and the number of inline fans, influence the creation of the best growth environment.

What size exhaust fan for 5×5 grow tent?

The best inline exhaust fan for a 55 grow tent is 6 inches in diameter and has a capacity of around 400 CFM. There were 44 questions that were connected.

How can I cool my grow tent without AC?

How To Keep A Grow Tent Cool Without Spending A Bunch Of Money

  1. 1 How to Cool a Grow Tent (with Pictures). 1.1 Replace incandescent grow lights with LED grow lights. 1.2 Keep ballasts and drivers outside of the grow tent to prevent them from being damaged. 1.3 Move the air in and out of the tent on a regular basis. 1.4 In the grow tent, use an oscillating fan to circulate the air. 1.5 Install a Swamp Cooler in the Grow Tent
  2. 2 Cooling a Grow Tent: Final Thoughts
  3. 1.5 Install a Swamp Cooler in the Grow Tent

Should I open the flaps on my grow tent?

Some tents are equipped with built-in ventilation flaps at the bottom, which are particularly useful in hot weather. If you open one of them, it will aid your intake fan in drawing in more fresh air and overcoming the extra negative air pressure that a grow tent cannot withstand. Otherwise, if the tent is in a dark room, it is OK to proceed with it.

Do you need to vent grow tent outside?

It is vital to have adequate ventilation in your grow tent.

Plants can get anemic and eventually wither and die if they do not receive enough fresh air and exhaust enough stale air. We all require fresh air, and a closed environment such as a grow tent is not equipped with any ventilation by default.

What size extractor fan do I need for Grow tent?

In order to determine the extractor fan size for your grow room or tent, multiply the grow room volume (cubic feet), the carbon filter factor (+25 percent), the insulation factor (20 percent), the ducting factor (+10 percent for 10 feet), and the light factor (+10 percent for 1000W) by the following formula: You’ll be given the fan size in cubic feet per minute (CFM).

Can I use a fan to dry my buds?

A fan, automobile heater, and a PC fan are all examples of what is available. Any fan is a good option since appropriate marijuana drying does not offer direct air to the buds; for quick drying, direct air is one of the greatest possibilities; warm air is also a good option because it helps the buds dry faster (many people use PC fan, because of its warm air).

When should I run my carbon filter?

To put it another way, carbon filters need to be replaced after 18-24 months of continuous (24/7) use. Depending on how harsh the environment is, they can endure up to 4 years. This lifetime, on the other hand, is dependent on the carbon quality, consumption, humidity, and plant species, among other factors.

How do you place a fan in a grow room?

Air circulators should be pointed at a wall or ceiling to maximize efficiency. Put it in the center of a square tent and you’re done! (use multiples in larger areas). If you have any other type of fan, be extremely cautious to set it on the floor and direct the air upwards in order to guarantee that the temperatures at the top and bottom of your growing space are more evenly distributed.

Do you need fresh air in a sealed grow room?

Simple definition: A sealed room is a growth environment that has no openings or air exchanges with the outside world or with any other room in which it is located. It is not required to be completely airtight; nonetheless, the closer it is to being completely airtight, the better.

Should you put a fan on seedlings?

A fan can assist in ensuring adequate air circulation around seedlings. Don’t direct the fan directly at your seedlings; instead, aim it to generate a gently breeze for them. Maintain the fan’s operation 24 hours a day. In addition to assisting in the prevention of illness, the continual air flow will aid in the development of stronger, more enduring seedlings.

Can I vent grow tent into attic?

Experiment with venting the grow tent into the attic or chimney. Many farmers believe it to be a viable choice for venting their plants. However, there is a possibility that some significant complications will arise. First and foremost, there is the question of whether or not to use the term “issue” in the context of this document. First and foremost, there’s the fragrance. When you vent your grow tent into your attic, you will avoid the accumulation of humidity and heat.

What causes high humidity in grow tent?

When the temperature within your grow tent is greater, more water vapor will be able to be held in the air. The heat generated within a grow tent allows water to travel more quickly through the air, resulting in increased relative humidity.

Is negative air pressure bad for Grow tent?

It provides a steady atmosphere for your plants while also reducing the possibility of mold or mildew development on them.

Negative pressure in your grow tent is a certain approach to provide the optimal and most stable environment for your plants to develop, even if there are reasons to employ positive pressure or equalized pressure in your grow tent.

Do light leaks matter during veg?

Plants emit oxygen when the lights are turned off. Furthermore, the transition from an 18-hour vegetative cycle to a 12-hour blooming cycle indicates to the plants that it is time to flower. Any light leaks that occur after the switch have the potential to disrupt this and force the plants back into vegetative development. In some plant species, you may even encounter genetic anomalies that are not present in other species.

What size fan for 2×4 grow tent?

We recommend the 4 inch fan from AC Infinity for anything that requires less than 205 cfm. We suggest their 6 inch fan for anything that requires less than 402 cfm. We suggest their 8-inch fan for anything that requires less than 807 cfm. If your tent’s airflow requirements exceed 807 cfm, you’ll need to install many fans in it.

Do grow tents keep the smell in?

Simply said, grow tents will not be sufficient to keep smells at bay. The materials and components that make up a grow tent system (reflective mylar, tent canvas, inline duct fan, ducting tubes, and so on) do not meet the requirements for being smell proof.

Do you need AC for grow tent?

If the temperature range in your grow room is consistently between 60 and 85 degrees Fahrenheit, you can get by with simply a dehumidifier and a fan to keep things running smoothly. If your grow room is enclosed, you’ll need to install an air conditioner.

What is the best way to cool a grow room?

Systems for Cooling Grow Rooms

  1. Air conditioners are used to cool the air. If you choose the correct air conditioner for your grow room, it might be a fantastic choice for cooling it. Fans can also be used to cool grow rooms. • Dehumidifiers
  2. Water cooling systems
  3. Proper ventilation will guarantee that your grow room exhausts hot air from the space, keeping your plants cool. • Dehumidifiers

What size exhaust fan for 10×10 grow room?

If you have an 8-foot-high ceiling in a 10′ x 10′ room, your cubic footage totals 800 cubic feet. If you want to evacuate the air every 5 minutes, you’ll need an exhaust fan with an acfm rating of roughly 160 in order to do this.

Grow Room Air Circulation & Ventilation ⋆ HTG Supply

On October 27th, 2017, HTG Supply published an article. For this week, we’re going to keep things light and airy — let’s talk about grow room ventilation! A healthy plant’s growth and development are affected by a variety of factors in the natural environment. These include sunshine, rain and groundwater, beneficial insects and animals, and meteorological conditions. However, when we cultivate plants indoors, we must actively adjust for the conditions that are not favorable to the plants. However, while it is apparent that you should water your plants and provide them with adequate light, most people don’t give much thought to the wind until it blows – but your plants surely do.

We’ll also walk you through the process of calculating your CFM requirements.

VentilationCirculation in the Grow Space

HTG Cranberry’s ventilation and circulation setup for a grow tent comprises a fan/filter exhaust system as well as a basic 9-inch fan for air movement and circulation. The absence of enough air circulation to simulate the wind that happens naturally outside may result in your plants becoming spindly and feeble. Plants are forced to strengthen their fibers as they develop in order to avoid bending or breaking in the wind in the wild. Because of the stronger fibers, the plant as a whole grows bigger and stronger, resulting in higher yields and a longer period of growth overall.

Furthermore, did you know that photosynthesis can only occur when plants are able to ‘breathe’ properly?

Stomata are like tiny small noses that allow carbon dioxide (CO2) to be inhaled and oxygen to be exhaled.

This allows the plants to “breathe” more oxygen. You may also create a situation that is more similar to what plants would experience outside in the natural environment in which they have evolved to flourish by employing air circulation fans to flow that fresh air across the plant’s leaves.

Air Circulation with CO2

In any case requiring CO2 enrichment, proper air circulation inside the grow room is vital to the success of the operation. Because CO2 is heavier than oxygen, you must ensure that the air in your tent is moving enough to prevent the CO2 from just dropping to the ground beneath your feet. The good news is that, as long as we’re talking about air, this shouldn’t be too difficult to do. A couple of modest fans in the corners (or one oscillating fan gently moving back and forth) should be plenty for most small setups.

Talking about enrichment, plants have evolved to be able to utilize much higher levels of CO2 than what is currently available in our natural environment, and when the levels of CO2 in your garden are raised, plants will respond by increasing their metabolic activity – producing more sugars, energizing growth, and increasing overall yield size by up to 30%.

If you haven’t already, this is an excellent reason to consider investing in a sealed grow room.

Many gardeners utilize their tank and CO2 tank regulator (or a CO2 generator) to boost their CO2 levels exclusively during the light cycles, then exhaust their air during the night cycle.

However, if you have a smaller setup, such as a 44 tent, you can get away with a $35 Exhale bag that will last you nine months.

TemperatureHumidity Control

We haven’t finished yet! Instead of simply aiding in the growth and redistribution of CO2 throughout your plant, air circulation serves a variety of other functions as well. The temperature and humidity in your garden are also affected by the airflow in your garden. On a hot summer day, you probably appreciate the refreshing air provided by a fan. You may even consider opening a window to allow some fresh air to flow in. Your plants, on the other hand, require the same level of attention. Plants “sweat” in the same way as humans do, only they do it all of the time.

  • You may already be aware that plants absorb nutrients and water from the soil, but you may not be aware that all of that water cannot possible remain in the plant; rather, moisture is continually being drained from the plant’s leaves, flowers, and stems.
  • If your plant is transpiring at a healthy pace, the air surrounding it may get highly humid.
  • Instead, it sticks to the surrounding area of your plant.
  • In addition, a particularly humid atmosphere can cause your soil to dry out much more slowly, which might result in a weak or “lazy” root zone in your plant.
  • All of these issues may be prevented by maintaining optimum humidity levels, which is a simple chore when your home is equipped with enough air movement and ventilation.
  • The difference in humidity, on the other hand, is significant.
  • Plants in their vegetative development phase, on the other hand, require far less water, flourishing in the 40-70 percent range (50-55 percent is considered optimal).
  • Having said that, keep in mind that your plants will not thrive in an environment that is excessively dry.
  • This may cause feeding to be delayed, resulting in a little, starved plant that may eventually dry out and die completely.

If it is within your financial means, consider installing a temperature and humidity controller to your ventilation system. These controllers trigger ventilation based on the temperature and humidity levels that have been measured in real time.


Plants might also become stressed if the temperatures in your grow room or grow tent are too high. More moisture is held in hotter air because the molecules in the air are energized by the heat, causing them to move around more quickly and expand, allowing more molecules to enter the air as a result. To compensate for the VPD (vapor pressure deficit), plants will transpire rapidly, rendering them unable to restore the water and nutrients lost as quickly as they are being depleted. Increased heat and VPD imbalances can also result in hermaphrodites and poorer yields, in addition to challenges in hydroponic systems and difficulties in managing smells.

See also:  Why Get A Roof Top Tent

Indoor Garden Air Circulation Setup

The use of various tools to monitor and adjust your relative humidity and temperature is becoming increasingly popular, but the devices are only as useful as the underlying logic that underpins the system. Isn’t it true that if a fan isn’t directed towards something, it does nothing? While it’s a stupid example, the point is that your system must be properly configured before you can begin working on it. It is possible to achieve satisfactory outcomes if you perform a good job, but it is necessary to consider things through in order to achieve exceptional results.

Although opening your vents is a remedy, it is not the most effective.

A simple duct fan is all you really need for smaller spaces such as a tent – simply place it directly in your tent’s vent port (preferably one that is higher up) and you’re good to go; it will suck unwanted air out of your tent while simultaneously opening the vent on the other side to allow fresh air to replace it, and you’ll be good to go.

  • If you’re feeling very inventive, you may use a second duct fan to create a somewhat more sophisticated configuration.
  • Due to the fact that hot air rises, this will effectively remove the warmest air from the tent.
  • For this purpose, a 4′′ duct fan will enough in the majority of tents.
  • To be on the safe side, we recommend using a fan that is somewhat larger and/or powerful while blowing OUT rather than sucking in.
  • “In a 9′ by 13′ space, I would have around 10 fans in all,” Will from Commerce City explains.

To demonstrate what I mean, I drew a diagram – please don’t judge my drawing abilities!” (We completely misjudged Will’s sketching abilities and redesigned the artwork, so please accept our apologies!)

How to Calculate CFM Requirements

There’s a rather straightforward formula for determining how powerful your fan should be in order to circulate your air as efficiently as possible. We’ll use the dimensions of width x length x height. (For example, a tent or chamber of 12 feet by 10 feet by 8 feet is 960 cubic feet.) You’ll need to pick how frequently you’ll want to replace the air in the room now. We’ll use 4-minute intervals for the purposes of this demonstration. The Cubic Feet Per Minute, or CFM, is calculated by dividing the number of cubic feet (960) by the number of minutes (4).

  1. Consequently, an outtake fan (or a set of outtake fans) with a rpm of roughly 240, or possibly somewhat higher, is what we’re searching for.
  2. There’s one more thing to consider: the lighting we use.
  3. In that case, we simply add 10% to our total for every 1000w of lighting that we use.
  4. Don’t worry, all of our duct fans are clearly labeled with their CFM ratings, and if you have any questions, please don’t hesitate to contact us.
  5. If you are unable to locate a fan with a CFM that is directly in line with your calculations, you may always purchase a bigger fan and utilize it in conjunction with a fan speed controller to get the desired airflow.
  6. Even in a sealed room, we propose a thorough air exchange at least twice a day, or up to four times a day if a CO2 producing burner is being used, because combustion results in an accumulation of ethylene in the environment.
  7. However, severe symptoms will emerge as wilted-looking leaves that have preserved their turgidity, which indicates that the problem is advanced (water pressure inside the plant).
  8. If you do not provide your plants with the right amount of oxygen they require, they will not develop to their full potential.


For those of you with more complex requirements, air filtering will be an additional issue to take into account. While we touched on it briefly previously, HEPA input filters are the way to go if you have a large or sophisticated setup and want to be certain that your plants are protected. To use a GrowBright HEPA filter, just slip one over your intake fan/port and you’ll capture 99.97 percent of airborne particles 3 micrometers in size or smaller. An activated carbon filter for your outtake fan will provide additional protection (as well as odor control) and will be quite effective.

It is recommended that you use these sorts of filters for indoor growth since they improve airflow rates, but they will reduce the airflow rates of the ventilation system’s partner fans.

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Tips for Improving Air Circulation in Your Grow Room

The movement of air in a grow room is an essential component of every gardener’s setup. Mold, mildew, and other fungus can thrive in environments with little air flow. As a result, unfavorable growth circumstances and impaired plants are created. With a few simple tweaks, your grow room may become a breeze to maintain and clean up afterward.

Increasing Air Movement

Fans are a simple and effective technique to improve air movement in a small space. In combination with other fans, they may be installed on walls or ceilings or simply set on the floor to provide regular air movement throughout a big room. Fans can also be equipped with oscillating heads, which allow air to be moved in multiple directions throughout a room. The fan size should be appropriate for the available growing space. They can be as enormous as industrial fans or as little as computer fans, depending on their size.

  • As a result of being exposed to air movement from seedlings, stems and branches become tougher and more thick as they get older.
  • This results in a more plentiful yield as well as a more formidable defense against pests and disease.
  • Wind burns can arise as a result of this, and it can do more harm than benefit.
  • The use of oscillating fans can help to alleviate this problem.


Another excellent method of ensuring optimum air circulation for your plants is through ventilation. Although it is sometimes used interchangeably with the term “fans,” they do not necessarily refer to the same thing. The air is moved around the room via fans. Taking old air out of a space and replacing it with new air from an outside source is what is meant by the term “ventilation.” Installing intake and exhaust vents might appear to be a difficult and time-consuming process, but it is not as difficult as it appears if you know where to begin.

Know Your Space

To begin, multiply the size of the grow room by three dimensions: height, length, and width. This will give you the volume of air that has to be circulated in order to maintain a healthy environment. This will be measured in CFM (cubic feet per minute), or cubic feet per second. The size of the space will define the size of the intake and exhaust fans that will be required to operate effectively. Example: If the grow space measures 8ft 8ft 12ft = 768 CFM, the plant will require 768 CFM (cubic feet per minute).

  1. Using a carbon or HEPA filter in the exhaust vent will make air flow work harder (at least by 25 percent) to escape the filter, which will result in higher energy consumption.
  2. This might look like this, based on the preceding example: 1.25 times 768 is 960 CFM in total Filtering is required.
  3. It is mandatory that all fans have a CFM rating printed on their labels.
  4. This is a wonderful place to start when it comes to ventilation.
  5. They help to keep your grow space free of contaminants.

A carbon filter attached to your exhaust vent will prevent any strong scents from escaping into the surrounding environment. Replace or clean your filters by the replacement date (which is mentioned on the package) to maintain your environment clean, healthy, and efficient.

Active or Passive Ventilation

Active ventilation is achieved via the use of fans or blowers to aggressively move air into and out of the grow area. Using fans or air conditioning ducts to circulate air can accomplish this. When air is allowed to naturally enter the grow area through an open intake port, passive ventilation is not required; instead, just a fan is required to drive the air out of the room through the exhaust port. The intake port should be greater in diameter than the exhaust port, and vice versa. This will allow for easier entry of new fresh air, as well as more efficient operation of the exhaust fan, while also preventing any extra CO2 from being trapped in the room.

In this case, the removal of hot air is made easier since hot air naturally rises and will only take a little amount of force to be removed.


There are four aspects that influence the temperature of a grow room’s optimum environment.

  1. When the UV lights are turned off, within the grow room
  2. When the UV lights are turned on, inside the grow room During the daytime, the temperature outside is higher than the temperature at night.

Because indoor crops may be produced all year, determining the best way to maintain an appropriate grow room temperature is dependent on your climate and geographic location. During the summer months, if the outside temperature is over 100°F and the grow room temperature needs to be kept between 70 and 80°F, the grow room will overheat once the UV lamps are turned on, causing the plants to die. This implies that your plants will suffer as a result of this. This is one of the reasons why some growers choose to run their grow rooms on a “lights-on” cycle at night and a “dark” cycle during the day.

Control or Timers

Using controllers or timers to automate some of the tasks associated with maintaining the grow room can save time and effort. Many growers have relied on them to manage the electricity going to their lights, fans, air conditioning, and vent systems, among other things. They might be as simple as a standard timer purchased from your local hardware shop or as comprehensive as a digital interface that you can operate and alter from your smartphone or other mobile device. An additional excellent method of improving air circulation and combating mold formation is to prune back the leaves and branches of the plant towards the main stem.

This will allow oxygen to circulate freely throughout the plant, preventing the growth of mold and mildew.

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