How Many Exhaust And Intake Fans Do I Need For Grow Tent

Intake Fan for Grow Tent

The use of air intake fans for indoor cannabis cultivation is something that many growers overlook because they believe that passive ventilation is sufficient enough. As a result, many growers are left wondering, “Do I really need an intake fan for my grow tent?” When it comes to growing cannabis indoors, air intake fans are typically what many growers overlook because they believe that passive ventilation is sufficient enough. However, you must understand why they are useful as well as the benefits that may be obtained by putting one in place.

What is an air intake fan for a grow tent?

In order to draw in fresh air into your grow room from the outdoors or from another room in your house, you will need to employ an indoor air intake fan. It is done in order to cool down the air in the room and to refill the quantity of oxygen and carbon dioxide in the air that is currently present.

Differences between air intake and extractor fans

An indoor intake fan and an extractor fan are essentially the same thing; they may be used interchangeably and can be reversed as needed to suit the situation. Keeping the strength of the air flow in mind, however, is essential in order to do this task successfully. Always bear in mind that the air intake fan in your grow room should only have one-quarter the power of the extractor fan when designing and installing a ventilation system for your space. This is done in order to maintain a balanced pressure in the room and prevent the CO2 and O2 levels from being out of balance.

Types of Air Intake | ActivePassive

Growing in a greenhouse or tent may be made more comfortable by increasing air intake in a variety of ways. You can do this actively by employing an intake fan, or passively by utilizing a powerful extractor fan in conjunction with passive filtering grids. Light passive ventilation will always be beneficial when growing in tents inside, as it will allow any additional scents to remain in the tent rather than leaking out into the environment. Passive ventilation also helps to increase the performance of any carbon filters that you may have connected to your extractor fan.

Passive Indoor Air Intake

Air intake to your grow room or tent may be increased in a variety of ways; you can do it actively by employing an intake fan, or passively by utilizing a powerful extractor fan in conjunction with passive filtering grids. Light passive ventilation will always be beneficial when growing in tents inside since it will allow any additional scents to remain in the tent rather than escaping. As an added bonus, passive ventilation helps to increase the performance of any carbon filters that you may have connected to your extractor fan.

Active Indoor Air Intake

If you’re utilizing an intake fan or a reversed extractor fan to create an active indoor air intake system, you’ll want to locate it at the bottom of the grow tent or grow room in order to get the most fresh air possible. Use a segment of aluminum tubing to create an air intake system that allows you to direct the flow of fresh air into and around your plants for the best results. In addition, you should install an anti-pollen filter to keep insects and diseases out of your grow room. If you are concerned about animals entering into your home, you may also put a chimney cap on the outside if required.

Additionally, we strongly urge that you position a rotating fan near your air intake, whether it is passive or active, and that it be directed toward your plants. This is done in order to ensure that the fresh air does not become stagnant in a corner and really reaches your plants.

How long should you have your air intake fan on?

A common rule of thumb is to turn on intake fans for 15 minutes and turn them off for 45 minutes every hour. Although it is possible to change the air flow and the length of time it is on if you have a little more expertise, you should only do so if your grow room requires it. You’ll need to keep track of a variety of variables, including humidity, temperature, CO2, oxygen, and the stage of development that your plants are in. You may accomplish this manually by experimenting with the timing on your intake fan, the power of your extraction fan, and the temperature and humidity readings from a thermo-hygrometer.

How strong should your intake fan be?

In order to determine the square meterage of air flow required from your intake fan, you’ll first need to determine the strength of your extractor fan, which you should be able to discover in the instructions or on the package. You’ll need to divide the strength by four to get the needed strength of your intake fan, and the resulting figure will be displayed on the screen. The following approach can be used if you do not yet have your extractor fan and are unable to perform the necessary calculations: calculate the width, length, and height of your grow tent or grow room, then multiply the result by 60 (minutes each hour), and then divide the resultant amount by 4.

  • 2 x 2.5 x 2.1m (width, length, and height)
  • 2 x 2.5 x 2.1m (height)
  • When you multiply all of these numbers together, you get 10.5
  • Once you’ve done that, multiply the result by 60 to get 630.

630 is the m3/h strength that your extractor fan will require, and when divided by four, you obtain the results of your air intake. It will need a powerful intake fan to keep up with the extraction rate of your extractor, which is 157.5m3/h.

GB The Green Brand Intake Fans

If you want to keep up with your extractor, your intake fan will need to be 157.5m3/h in size.

Inline Intake Fan for Grow Tent

Grow tents and smaller grow rooms are common places for cannabis cultivators to install intake fans, such as this one. They may be simply switched to serve as an intake fan, or they can be utilized to provide a little more boost halfway through the pipe for your typical extractor fan. Instead of compressing air, this specific device merely absorbs it and softly pushes it out the other end.

Two Speed Intake Fan for Grow Tent

In addition, the two-speed intake fan is ideal for indoor gardening. Although it appears to be rather different from the inline intractor fan, this is due to the fact that it comes with two reducers for installation and allows you to select between two different speeds; it is therefore both adaptable and useful. Intake fans such as these are commonly seen in grow rooms with only a few lights and in basic 1.21.2m grow tents, and these are just a few examples. However, as previously said, you can use virtually any extractor fan as an intake fan as well; just make sure that the devices you select are powerful enough for your grow room.

Quick Answer: How Many Exhaust And Intake Fans Do I Need For Grow Tent

Larger grow tents can also benefit from passive air intake, but they will necessitate the use of 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.

Do I need intake and exhaust fan for Grow Tent?

The use of passive air intake can be beneficial in larger grow tents as well, but they will necessitate the use of greater CFM exhaust fans. When it comes to indoor gardening, air input is only a small portion of the puzzle. It takes a variety of parameters, like tent size, grow lights, and inline fan speed, to create an ideal growth environment for a plant to flourish.

How many fans do I need in my Grow Tent?

The exhaust system of your tent must have at least one powerful fan that will transport the air out of the tent and vent it to the outside environment.

Do you need fresh air in a sealed grow room?

There is no air removed from or pulled into the grow-space from outside the enclosed grow-space. Although air temperature, relative humidity, and CO2 levels are important factors to consider when growing, they are not the only ones that should be considered. Generally speaking, odors are not an issue in the room because it is airtight.

Can I leave my fan on 24 7?

Reduced frequency of fan starts and stops can assist to lessen the stress associated with starting, and may even help to increase the fan’s lifespan. Leaving the fan running all of the time guarantees that the air is cleaner since it is being drawn through the filter or UV light system. This may be preferable for persons who suffer from allergies.

What size extractor fan do I need for Grow Tent?

Grow room capacity (cubic feet), carbon filter factor (+25 percent), insulation factor (20 percent), ducting (+10 percent for 10 feet) and light factor (+10 percent for 1000W) are all factors to consider when determining the size of your extractor fan for your grow room or tent. You’ll be given the fan size in cubic feet per minute (CFM).

How long should you run carbon filter in grow tent?

To put it simply, carbon filters need to be replaced after 18-24 months of continuous (24/7/365) 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.

Can I vent grow tent into same room?

Even while venting your grow tent into the same room is perfectly acceptable, it is not ideal. If you apply the additional actions outlined above, you will be able to make a slight improvement in the situation. However, it is preferable if you are able to run ducting to carry the grow tent exhaust a longer distance. You may move it to a different room or outside your house.

How many fans should a grow room have?

A simple ventilation design will necessitate the use of two different types of fans, at the very least. These are the ones: Extractor fans are also known as exhaust fans in some circles. Designed to remove hot and humid air from your grow room or tent, these fans are placed to do just that.

Do you need two fans for Grow Tent?

To keep the air in your grow room as fresh as possible, you’ll need both a fan and an air extraction device.

What size exhaust fan for 3×3 grow tent?

Member who is well-known. 6 inches is far too big for a 33. Every 2 minutes, you should take a deep breath and exhale. Calculate your cubic feet and divide the result by two to get the exact cubic feet per minute you want to be running at.

Should I leave my fan on when lights are off?

During daylight hours, both exhaust and oscillation fans should be functioning, as they should always be.

If you have 2-3 oscillating fans, one intake fan, and one exhaust fan, you should leave the oscillating fans running throughout the whole dark time. In addition, switch off the other fans one hour after the light is turned off.

What size exhaust fan for 5×5 grow tent?

Another 6 or 8-inch fan should be used for tent exhaust. This fan should be mounted again outside the tent, this time near to the outside air opening. If you are concerned about stinking air blowing outside the tent, you may hang the necessary charcoal filter inside the tent. This will prevent this from happening.

Do you need a carbon filter for Grow Tent?

When it comes to growing tents and grow rooms, activated carbon filters are commonly utilized to decrease smells and regulate emissions. In the end, you will have cleaner air that is free of odors, spores, and other allergies. Odors and emissions have an impact on how pleasant your house is to live in; they may be uncomfortable at the very least and potentially dangerous at the very worst.

Is it better to push or pull air through a carbon filter?

To prevent dust, mold, and other particles from clogging the activated charcoal in the filter itself, Can-Lite filters are equipped with pre-filters. As a result, you should be drawing air through the filter rather than pushing air into it. Thus, the carbon filter will continually “clean” the air in your growing space to eliminate scents as they are released into it.

How many fans 5×5 grow tent?

Because a 55 grow tent may only accommodate one or two fans, make sure that they are carefully placed throughout the tent. Personally, I’d invest in a stand fan to ensure that all of my plants had access to fresh air. This fan is attached to the ducting of your grow tent through an inline connection. Its purpose is to remove heat from the interior of your grow tent, and it is made of metal.

Should I run my carbon filter 24 7?

During veg stage, you should run the inline fan continuously, but if you want to extend the life of your carbon filter, you shouldn’t have it connected at all during flower stage. Only when the buds begin to give off their aroma should it be connected during flower stage if you need it to mask the smell. During the growing process, mine are unhooked until I need to filter the smell.

See also:  How To Set Up A 20 X 20 Tent Party

Can you leave your grow tent open?

Yes, theoretically, you are allowed to keep it open. It is my goal to be able to control as many factors as possible, and growing under a tent allows me to do this. You’re exposing your plants to everyone and everything in the room as a result of this.

How much fresh air does a grow room need?

It is recommended that the air in your grow area be swapped at least once every 5 minutes. If you are using a grow tent that is 5′ x 5′ x 6′, you will be able to hold 150 square feet of air. Airflow rates of between 30 and 60 cubic feet per minute are required for best performance from your filter and fan (CFM).

Quick Answer: How Many Fans For 2X4 Tent

An inline grow tent fan (with a capacity of around 215cfm) would be sufficient for a 44 grow tent covering an area approximately 106 cubic feet.

How many fans 2×4 grow tent?

A grow tent fan (inline fan) rated for 215cfm would be sufficient for a 44 grow tent with an area of around 106 cubic feet.

Does a 2×4 grow tent need an intake fan?

So, for a 44 grow tent with an area of around 106 cubic feet, a grow tent fan (inline fan) with a capacity of 215cfm would be sufficient.

What do I need for a 4×4 grow tent?

In this case, the total light power required for a 44 grow room is around 800-1200 watts.

You may get it from a single 1000-watt bulb or from a number of 600-watt lamps. There are many growers who believe that one 600w light at a near height might be beneficial. However, unless you’re growing in a 3/4-inch pot, a 600-watt bulb will not enough (or smaller tent).

Should Grow Tent fan run all the time?

Consequently, it is recommended to keep the lights on during the time the fans are working. It will aid in the reduction of humidity while also lowering the temperatures in a grow tent. It is necessary to lower the speed of your fans after 15 minutes of operation when the lights are turned off.

Should I leave my fan on when lights are off?

During daylight hours, both exhaust and oscillation fans should be functioning, as they should always be. If you have 2-3 oscillating fans, one intake fan, and one exhaust fan, you should leave the oscillating fans running throughout the whole dark time. In addition, switch off the other fans one hour after the light is turned off.

Do Grow Tents need 2 fans?

Oscillating fans should be installed in the 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.

What size exhaust fan for 4×8 grow tent?

I would recommend an 8-inch fan with a filter for extraction purposes. A 6 inch will most likely fulfill your requirements. A carbon filter, on the other hand, affects the efficiency of the fan.

What size exhaust fan for 3×3 grow tent?

Member who is well-known. 6 inches is far too big for a 33. Every 2 minutes, you should take a deep breath and exhale. Calculate your cubic feet and divide the result by two to get the exact cubic feet per minute you want to be running at.

Should exhaust fan always be on in grow tent?

Explanation in mathematics: In practically every grow tent, an exhaust should be used to circulate the air within every three minutes to keep it fresh. To optimize the exhaust in accordance with the ideal exhaust time, we just divide the overall capacity of our grow tent by three, which results in the optimal exhaust duration.

How many fans do I need in my Grow Tent?

It is possible to calculate the strength of the exhaust fan that you require based on the dimensions of your grow room. The exhaust system of your tent must have at least one powerful fan that will transport the air out of the tent and vent it to the outside environment.

How much can a 4×4 grow tent yield?

An average 4X4 grow tent produces around 6 medium-sized cannabis plants every three months at its maximum yield potential. The answer is dependent on your growing strategy, as well as the varied types and grade of equipment that you employ in your operation. Indoor plant cultivation with grow tents is a terrific option no matter where you live or what sort of environment you have to deal with.

Can I leave my fan on 24 7?

Reduced frequency of fan starts and stops can assist to lessen the stress associated with starting, and may even help to increase the fan’s lifespan. Leaving the fan running all of the time guarantees that the air is cleaner since it is being drawn through the filter or UV light system. This may be preferable for persons who suffer from allergies.

Can I vent grow tent into same room?

You may run ducting from the exhaust on your grow tent and direct the exhaust towards a different room or outside your home if you choose.

Alternatively, you may just vent it into the same room in which the tent was placed. The second alternative is, without a doubt, the more straightforward. It also eliminates the most significant drawback of venting outside your home: the presence of a noticeable heat signature.

Can you have too much airflow in grow tent?

Having an excessive amount of CFM flow in your tent is not necessarily an issue, unless you don’t have enough passive intake ports and the tent walls are bending in, in which case the fan will be put under undue stress. In such situation, you may also use active input fans to aid in the system’s overall balance.

What size LED light for 4×4 grow tent?

For the reason why LED lights are typically recommended for grow tents, we will only cover the finest LED grow lights available on the market for your tent. To light a 44 tent, a grow lamp with an actual wattage range of 500-600 watts should be used (assuming blooming plants that demand a lot of light and are collected in a single location).

Should I run my carbon filter 24 7?

During veg stage, you should run the inline fan continuously, but if you want to extend the life of your carbon filter, you shouldn’t have it connected at all during flower stage. Only when the buds begin to give off their aroma should it be connected during flower stage if you need it to mask the smell. During the growing process, mine are unhooked until I need to filter the smell.

Can you leave your grow tent open?

Yes, theoretically, you are allowed to keep it open. It is my goal to be able to control as many factors as possible, and growing under a tent allows me to do this. You’re exposing your plants to everyone and everything in the room as a result of this.

How many plants can grow in a 4×4 tent?

4-6 plants, depending on the technique of cultivation and the style of cultivation. Always keep in mind that you want to ensure that there is adequate ventilation around your plants. If you have too many plants, the air becomes stagnant, and you create problems with your buds and leaves.

How long should a fan be on in a grow room?

You have the option of running your fans continuously or on an intermittent basis, such as every 15 minutes, for example. It is recommended that you keep the fan running if you tend to grow in a humid environment, and vice versa if you live in a dry region.

How often should I exhaust my grow room?

Exhaust fans are often rated in cubic feet per minute (CFM), which refers to the volume of air that is pushed. A ventilation system that can exchange the air in your grow room AT LEAST once every three minutes will be ideal for your needs.

What size light for 5×5 grow tent?

For a 5×5 tent, it is advisable to use lights that are around 1000 watts (High-Pressure Sodium). Although HPS lights appear to be yellow in hue, they actually contain color spectrums that are yellow and red. For blooming plants, both of these spectrums are excellent choices.

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.

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

In addition to humidity, indoor growth systems might experience difficulties when it comes to maintaining proper humidity levels. Every day, plants release water vapor, which raises the humidity level in your growing space. The growth of pests and illnesses can be exacerbated by uncontrolled humidity, which leads to poor growing conditions. It also helps to wick away part of the water released during transpiration, which allows your plants to absorb more water and suck up nutrients through their root systems, resulting in increased development.

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.

  1. 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.
  2. 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.
  3. A very simple ventilation system.
  4. 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.
  5. 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.
  6. 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.
See also:  30 X 30 Tent How Many Square Feet

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

Plant health is greatly influenced by humidity levels. In your grow room, too much humidity may lead to illness, and too little humidity can have a negative influence on development, therefore we must keep an eye on the humidity level at all times. It is mostly transpiration that contributes to the humidity in the grow room. Transpiration is the process through which the leaves of a plant expel water into the surrounding environment. Suction caused by transpiration acts similarly to a straw, drawing nutrients up through the roots of plants as they generate water vapor.

  • You are not only denying them of water, but you are also essentially depriving them of all nutrients as a result of this practice.
  • As a result, you must be able to easily raise and lower the humidity levels in your grow room.
  • Simply venting the humid air out through an exhaust system will enough, provided that the air coming in from outside the room is less humid than the air coming in from within.
  • During the growth phase, you may find that you need to increase the humidity level a little.
  • Investigate the humidity levels that your crops enjoy and make every effort to keep the levels within acceptable ranges of humidity.

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.

  • Q.
  • The size of your bulb is one criterion that might assist you in narrowing down your fan search.
  • 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.
  • Q.
  • 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.
  • Additionally, you should invest in some inexpensive oscillating fans to assist you in regulating the temperature and controlling the airflow in your grow area.
  • 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.

Q.

A.

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?

Alternatively, you can share this post with other gardeners by commenting below.

The Green Thumbs Who Approved of This Article: Last updated on February 10, 2022 / Affiliate links included / Images sourced from the Amazon Product Advertising API

Grow Tent Ventilation Setup & Exhaust Guide

The importance of ventilation in your grow room cannot be overstated. As a result, poor ventilation is responsible for the majority of cannabis issues and leaf symptomatology. CO2 concentrations, temperature, humidity, and other factors are all taken into consideration. Cannabis plants are only able to survive under specific environmental conditions. It is at this point that grow tent ventilation and exhaust become important.

Why Your Grow Tent Ventilation Is So Important?

A grow room’s ventilation system cannot be overemphasized. Unfortunately, poor ventilation is responsible for the majority of cannabis difficulties and leaf symptoms. CO2 concentrations, temperature, humidity, and other factors are all taken into account in this calculation. A certain set of climatic conditions is required for cannabis plants to grow. Grow tent ventilation and exhaust are important considerations in this situation.

Keep The Perfect CO2 Level For Cannabis

Cannabis, like other plants, need carbon dioxide in order to live. However, when plants are enclosed in a small area, the CO2 in the air will soon be depleted and replaced by oxygen if there is insufficient circulation to the plants. So we’ll have to figure out how to restock it in some way. This means that the cold, fresh CO2-filled air should be drawn into your setup while the used air is expelled out the back.

Control Humidity And Excess Heat

Carbon dioxide is required for the survival of cannabis plants, much as other plants. In contrast, if plants are enclosed in a small area, the CO2 in the air will be rapidly depleted and replaced by oxygen if the enclosure does not have adequate air circulation. In order to refill it, we must find a mechanism to replenish it. Your system should have two-way air circulation, so that cold, fresh air enriched with CO2 enters while used air is expelled.

Avoids Pests And Plant Diseases In Your Tent

Mold and fungus aren’t the only types of organisms that producers must be on the lookout for and avoid. Protect your plants against insect pests, which can thrive in stagnant air and damp soils, as well as from other environmental factors.

It is difficult for spider mites and fungus gnats to fly when they are in well-ventilated areas. This means that if you have the proper fan and exhaust system, your plants will be lot safer from these insects.

Strengthen Stems

Finally, it’s vital to note that cannabis plants benefit from, and even require, a mild breeze in order to flourish at their ideal levels. This helps to give the stems a good exercise and keeps them from becoming too weak to sustain normal bud growth in the future. Your stems might get anemic if you don’t have a consistent wind blowing through your grow tent. This can lead to bowing. This, in turn, can hinder the leaves from absorbing enough light to effectively photosynthesize, resulting in a reduction in the ability of the plant to grow.

Ways To Setup A Ventilation System In Your Grow Area

It may be necessary to make an investment and experiment in order to find the optimal ventilation for your ventilation system. Nonetheless, it is a feature of your system that will almost certainly pay off in the future. For begin, there are two different methods to configure your ventilation: passive intake or active intake.

Exhaust Fan With Passive Intake

Passive intake depends on negative pressure to generate passive airflow, which is why it is called passive. Quite simply, you have a fan that is pushing air out of the tent, but there is no fan pushing air in from the other side of the tent. As an alternative, you may install an intake hole that allows new air to enter the tent passively. You can have a single passive intake hole that is approximately three or four times the size of the exhaust hole, or you can have many passive intake holes.

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This approach will cut energy use and will be the most effective for the majority of farmers.

Active Air Intake And Exhaust System

An active intake system, on the other hand, makes use of a fan to actively draw air into your growing environment. As a result, there are two fans who are cooperating. One to restrict the air from within the tent from blowing out, and another to keep the air from blowing in from outside the tent. When employing this technique, the size of the intake hole is less critical. Because an intake hole that’s almost the same size as an exhaust hole indicates that your grow tent is ideally suited for an active intake system, you should consider installing one.

The Ultimate Ventilation Setup

The fundamental concept of exhaust systems remains constant. Keeping clean, fresh air coming in while venting out old and humid air is critical for the system to function properly. However, there are other accessories and pieces of equipment that you may incorporate into your setup. The ideal ventilation design will not only keep your crop healthy, but it will also be discrete, resulting in the least amount of noise and aromas possible. I’m going to presume that your setup includes any or all of the following components:

  • The use of rope ratchets for securing your equipment
  • An exhaust fan (we’re going to use a passive intake for this project)
  • A carbon filter is used. Ducting and clamps are used. A deafening silencer
  • A fan that oscillates
  • Grow lights that are air cooled (most types of lights, such as LEDs, generate practically minimal heat and hence do not require inclusion in your ventilation system)

Ducting Your Fans And Accessories

The remainder of your equipment will be connected to your exhaust fan in the stages that follow this one, so pay attention. This will be accomplished by the use of aluminum ducting. Using flexible aluminum ducting, I have discovered that the right mix of price, adaptability, and convenience of installation may be achieved. However, insulated aluminum ducting will also work well if you want stronger duty ducting and have the necessary funds. Check for kinks and creases and smooth them out if necessary to guarantee top performance.

Also, try to maintain your path as short and straight as possible until you are outside the tent and the air is flowing freely. You will have a less efficient system the longer and more roundabout your journey is.

Inline Exhaust Fan

After erecting your grow tent, the first thing you should do is connect your exhaust inline fan to it. However, you should avoid connecting anything to your power source until you’re ready to begin growing. Step inside your tent and attach your exhaust fan to the exhaust hole in the floor of your tent. Hanging your fan from the ceiling of your tent is one option. Connect the fan’s exit port directly to the exhaust hole, or duct it if you find it more comfortable, and then close the fan off completely.

Carbon Filter To Deal With Odor

Using your exhaust system to your advantage might let you develop discreetly if you like. It is possible to keep the scent of cannabis out of your home by using a carbon filter. Your carbon filter is something that has to be considered while configuring your exhaust system. In order for the air from your grow tent to be expelled outdoors, it first has to travel through your filter. Many growers choose to employ the simplest possible configuration, which is to hang the carbon filter inside the tent.

In this manner, the air will first pass through the carbon filter, after which the exhaust fan will expel the filtered air to an outside environment (first picture).

In the event that you do this correctly, the only location where you’ll be able to smell cannabis will be when you’re inside your grow tent.

Silencer For Extra Stealth

When installing a silencer, it is best to position it immediately after the fan; but, if necessary, you may place it farther down the ducting. It works by muffleing the air coming from the exhaust, resulting in significantly less noise. And they are quite effective. My tent, which is located within the home, has a suppressor placed in it, and the decrease in noise is incredible. I highly recommend it. It also alters the sound style; it moves from being a dreadful whining to a pleasant swooshing that sounds more like wind as a result of the shift in volume.

Connecting An Air-Cooled Reflector (Mostly for HID grow lights)

If you’re utilizing high-intensity discharge (HID) grow lights, it’s extremely probable that your hooded fixture can accommodate ducting. You’ll need to have direct airflow passing through the light’s reflector in order for it to work properly. This will assist you in keeping the temperatures down as well as the light bulbs cool, which is important because HID lights generate a lot of heat. Depending on your reflector and how many additional accessories you have, this can add a significant amount of complexity to your setup.

Everything needs to be connected in a straight line. Starting with your CO2 filter and working your way up to your reflector is a good idea. After that, connect your reflector to your exhaust fan, and lastly to the exhaust port on your tent’s roof.

Sealing Your Grow Tent To Create Suction

A sealed grow tent guarantees that only air enters through the intake hole and only leaves exit via the exhaust fan when the tent is closed. Your exhaust system will be prone to air leakage and will be extremely inefficient if the seals are not properly installed. Sealing provides a separate environment, allowing you to regulate temperature, humidity, and CO2 levels independently. Additionally, it guarantees that your exhaust system is running at maximum efficiency. Your exhaust fan will generate negative air pressure as a result of reducing air leakage, allowing fresh air to enter via the intake hole.

When used in conjunction with a carbon filter, this will further reduce the likelihood of cannabis scents penetrating your house.

However, if you have tears or pinholes, you may use anything from duct tape to Black RTV Silicone to close them up again.

Check For Air Leaks

To check for air leaks, start by turning on your system and closing your tent from the inside outward. Moving an incense stick about the interior of your tent and observing its behavior can give you a better understanding of its behavior. If the smoke rises straight up into the air, the air is exactly where it should be. To finish, take the incense stick outside the tent and position it near to the intake hole on the other side. If the smoke snakes towards the intake, this is a strong indication that you have accomplished effective sealing and negative pressure in the engine.

Oscillating Fans

Oscillating fans are both inexpensive and quite effective. The process of blowing and spreading air uniformly within your grow tent, while also ensuring that the wind is powerful enough to keep the stems of your plants strong You may use floor fans that are placed in a corner of your room or grow tent fans that are much smaller and clip on to the poles of your tent to keep the heat out. It’s possible to hang it or place it in your room if you’re a bit of a do-it-yourselfer and you have a fan laying around.

The number of fans you need will depend on the size of your grow tent and the size of the fans you use.

There is no straightforward method of determining how many you require.

How To Calculate CFM For Exhaust Fans

To properly ventilate your grow tent, you must first determine how much fresh air is required in order to guarantee that your plants develop in a healthy manner.

You may determine the appropriate Cubic Feet per Minute (CFM) required to ventilate your tent using a formula, which is provided below.

1. First let’s find out your grow tent’s volume

While the height of your grow tent may vary, we’ll use a 4×4 grow tent with a pretty standard 8′ height as an example. (width) * (depth) * (height) = 128 ft 3 (width * depth * height)

2. Calculating Base CFM

The amount of air in your grow tent should be replenished by your inline fans once every two to three minutes, at the absolute least. The following is the formula: 128 feet/3 minutes =64 CFMB However, the temperature and humidity of the surrounding environment must be taken into consideration. If the room from which you’re obtaining the air is excessively hot, add an additional 20% to your calculations. And if you’re dealing with high humidity, increase the percentage by another 40%. In a hot and humid environment like mine, the result might be something like this: 64 (cfm) multiplied by 1.4 (humidity) multiplied by 1.2 (warm climate) Equals 108 Base CFM This implies that in order to adequately ventilate your 128ft 3grow tent, you must exchange 108 cubic feet of air every minute.

3. Factoring In Accessories

Now that you’ve calculated your basic CFM, you’ll need to add in your accessories, which may include ducting, grow lights, and a carbon filter or silencer, among others (where necessary). All of these factors might have an impact on how hard your fan has to work in order to create the ideal growth conditions. For example, any abrupt bends in your ducting will drastically limit the efficiency of the airflow through the system. A 90-degree curve has the potential to restrict airflow by up to 60%!

If you’re using a charcoal filter to eliminate scents emanating from your tent, add additional 60 percent to your calculations.

Accessories Effect on CFM
LED grow lights 20%
HID grow lights 50%
CO2 filter 60%
Silencer 20%
Ducting 30º Bend 20%
Ducting 90º Bend 60%

If we only had a few bends, a few LED grow lights, and a CO2 filter, we’d be in business. In the end, our CFM formula would be: 108 (base) * 1.2 (lights) * 1.6 (filter) * 1.9 (ducting) = 394 Total CFM Required You will now need to purchase an exhaust fan that can produce this amount of Cubic Feet of air per Minute, depending on the size of your grow tent and the accessories you will be using. Check out the greatest 6′′ inline fans that are capable of performing admirably.

Other Air Flow And Ventilation Tips

It is reasonable to expect some noise from your grow tent because it requires a powerful fan to air it. It is possible to reduce this so that your growth is more subtle and unobtrusive, but it is not recommended. Choose a fan with variable speed settings and a CFM rating that is 25 percent more than your requirements; this will allow you to run it at a reduced speed and so reduce noise. Furthermore, the majority of inline fan types are equipped with noise-reducing capabilities. However, as previously said, you may also connect a silencer to your fan, which will reduce the noise it makes.

CO2 Injection To Increase Yields

Injection of CO2 into a grow tent Plants, as most growers are aware, “breathe out” oxygen while “absorbing” Carbon Dioxide (CO2). While plants do not have lungs, they do have hundreds of small holes on their surfaces known as stomata, which allow them to collect CO2 from the surrounding environment. In contrast to us, they require more carbon dioxide in the air than oxygen in order to maintain optimum health. This invisible gas is essential to the process of photosynthesis, and your plants will “suffocate” and die if they do not receive enough of it.

It may even be possible to make your plants more resistant to heat and light by doing so.

Trying to get the most out of every situation.

Even novices and enthusiasts may get incredible yields in the absence of this. CO2 supplementation is a complicated procedure that may be accomplished in a variety of ways. Check out this professional tutorial from CO2Meter for more information on how to get started.

Grow Room Air Conditioner

Using CO2 to grow plants in a grow tent Carbon dioxide (CO2) is absorbed by plants, and oxygen is expelled by them, as most gardeners are aware. Even though plants do not have lungs, the hundreds of small holes on their surfaces known as stomata enable them to collect CO2 from the surrounding environment. They require more carbon dioxide in the air than oxygen in order to maintain excellent health, in contrast to us humans. Without this intangible gas, your plants will “suffocate” and die. It is essential to the process of photosynthesis.

Additionally, doing so might increase the resistance of your plants to high temperatures and sun exposure.

Every aspect of the process is being maximized.

Without this, novices and amateurs would undoubtedly get incredible yields.

To learn more about how to go about it, read this professional guidance from CO2Meter.

Final Thoughts

In conclusion, ventilation is extremely crucial to the health and production of your plants, as you can see. The more the degree to which airflow is left to chance, the greater the likelihood that you will be disappointed with poor yields. There are several methods through which you may exercise control over the ventilation of your grow tent in order to achieve maximum yields. Hopefully, you were able to choose one that best meets your needs. And remember to go back to this post anytime you have any questions.

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