How Much Air Do Your Plants Need In Grow Tent

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.

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.

This is called a light cycle (thus reducing the cost of their CO2 enrichment process). 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.

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.

  1. If you’re feeling very inventive, you may use a second duct fan to create a somewhat more sophisticated configuration.
  2. Due to the fact that hot air rises, this will effectively remove the warmest air from the tent.
  3. For this purpose, a 4′′ duct fan will enough in the majority of tents.
  4. 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.
  5. “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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Also, make sure you follow us on social media to receive notifications whenever we publish new articles like this one (and whenever we have our awesome sales). From all of us here, we wish you the best of luck, safety, and continued growth!


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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:  Where Can We Get A Tent For A Tent Revival

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 control in your grow room. 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

Make a rough estimate for the entire volume of your grow room by multiplying its length, breadth, and height together. This is the cubic footage of your room in cubic feet (cubic meters). Keep this phone number handy. Then we’ll multiply that by the efficiency loss to get the final result. Additionally, the efficiency of the filter varies depending on its age and manufacturer, as well as the length of the duct that connects the fan and the filter, among an unlimited number of other parameters.

You should use the following syntax in your formula: 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.

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.

  • You are not only denying them of water, but you are also essentially depriving them of all nutrition as a result of your actions.
  • As a result, you must be able to easily raise and lower the humidity in your grow room.
  • 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.
  • When it comes to growing plants, there are instances when you may need to increase the humidity level.
  • 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.

  • It is unhealthy for people to breathe in the high quantities of CO2 suggested for plants.
  • 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.
  • So, should you consider adding CO2 to your growing environment?
  • You must also consider the financial implications.
  • 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.

See also:  How Much Is It To Tent Your House

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 intake hole, bringing this principle into play during passive ventilation.

Consider negative pressure to be a journey beneath the surface of the water in a plywood box.

Assume that the water rushing in represents clean air and that the water leaving in bubbles represents dirty air.


Flexible aluminum ducting works well for most grow systems.

The important thing to keep in mind when selecting ducting is size.


If you have flexible aluminum ducting, the first thing you can do is smooth out the wrinkles.

This will increase the airflow and improve the performance of your ducting. You can also try to reroute the duct so that there are fewer turns in its course, and when possible shorten the length of the duct system.

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

Question: How Much Air Do Your Plants Need In Grow Tent

Hope you found our grow room ventilation systems instructional to be of assistance. 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 they can benefit from using grow room ventilation systems. As soon as you understand the fundamentals, you will be in a lot better position to select the most appropriate system for your needs. What kind of grow room ventilation system do you use and enjoy?

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

Why This Article Received a Green Thumb: Affiliation links and images from the Amazon Product Advertising API were used in this post.

How much ventilation do you need for a grow tent?

To figure out how many cubic feet per minute (CFM) you’ll need to adequately ventilate your grow room, use the following formula: / (Grow Space Width X Length X Height) = Recommended CFM (cubic feet per minute). The length and course of the ducting have an impact on the CFM performance of a fan. If you are utilizing a carbon filter, this will significantly impair the performance of your fan.

Do I need air intake in my 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.

Does a single plant need a carbon filter?

Is It Possible to Grow Without a Carbon Filter? If the answer is no, there is no other option except to incorporate a high-quality carbon filter into your growing environment. A carbon filter, on the other hand, may not be necessary if you’re growing outdoors, where you may take the air without filtering out the scents and leave them in the environment.

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.

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. Plants that bloom well in both spectrums are encouraged to do so.

Where do you vent a grow tent?

Here’s what you need to do (it’s simple): Install your grow tent, complete with a grow light inside. Install the exhaust fan at the very top of your tent, so that it is blowing air out of the tent. Make certain that there is an intake opening for fresh air to enter. Install a window fan that blows air out of the room where the tent is located.

How do you vent an indoor grow room?

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. You may also put in a dehumidifier to help with the humidity. When it comes to growing plants, there are instances when you may need to increase the humidity level.

Can I leave my 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.

Does plants need fresh air to grow?

Plants require fresh air in order to thrive and dispose of their waste properly. Photosynthesis is greatly influenced by the quality of the air in which it occurs. As a result, fresh air is essential for elevating your culture to a greater degree of development.

Can plants survive without fresh air?

Air is not required for the development of plants; they are capable of surviving without it. Plants breathe oxygen that they obtain from the surrounding environment. The air is absorbed by the roots of the plants, supplying them with the oxygen they require.

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.

Do you need fresh air in a sealed grow room?

Closed-loop systems entail the use of a grow chamber that is totally sealed. There is no air removed from or pulled into the grow-space from outside the enclosed grow-space. Instead, a heater and an air-conditioning unit work together to keep the temperature in the proper range at all times. The usage of dehumidifiers and humidifiers can help to regulate the humidity in a room.

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.

Do I need to vent my grow tent outside?

It is not required to exhaust the air that is drawn through the carbon filter outside of your growing area; in fact, depending on your configuration, it may even be preferable to have the filtered air returned to the growing area immediately.

How can I hide my grow tent in my room?

When using the sog method, it may be difficult to conceal the tent itself, but how difficult is it to conceal a tiny handfull of little plants, provided they are not at the blooming stage? Simply pull down the tent and store the plants in your closet, concealing them beneath boxes and/or clothes to keep them out of sight.

Are fans bad for plants?

Are fans harmful to indoor plants? Providing the fan is not directed at your indoor houseplant, it will cause no harm and may even have some beneficial effects on your indoor houseplant. Proper air circulation and ventilation, just as with sunlight and water, is critical to the health of your plant’s foliage.

How much airflow do plants need?

A 4″ fan (190 CFM) is sufficient for a garden that receives no more than 400 watts of light. When installing a carbon filter, some airflow may be sacrificed, although this is usually not an issue for an area of 8 or 9 square feet. When used in a 5′ × 5′ tent or other contained environment, a 6″ fan (420 CFM) is sufficient for gardening with up to 1,000w of power.

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.

See also:  What Is The Difference Between The Cortes Tent And The Octagon Tent From Coleman

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.

How Negative Pressure in a Growroom Can Maximize Yields

A simple, yet sophisticated pastime, indoor horticulture is a good example. For the most part, the same principles that apply to outdoor growing also apply to indoor cultivation. The amount of light, water, fertilizers, and environmental variables available to an indoor grow are all important aspects in how well it works. Indoor horticulture, on the other hand, is distinctive in that it allows for greater levels of control. However, that increased degree of control comes with a number of additional procedures that must be taken in order for an indoor garden to live up to its full potential.

Keep your growroom light tight and under a small negative pressure, to name a few of examples.

Slight Negative Pressure in a Growroom

Security It is a vital feature of indoor gardening that many rookie growers neglect until it is too late to correct the situation. Indeed, many indoor grows feature pricey equipment and precious produce that might draw the attention of unscrupulous individuals. Fertilizers and plant odors are especially likely to draw the attention of anyone who happens to be in the neighborhood. Various techniques may be employed to reduce or mask these scents, but if a grower does not have an adequate ventilation system in place, he or she will still have problems.

The ventilation system determines whether the negative or positive pressure in a growroom is present.

Negative Pressure vs. Positive Pressure

The ventilation system determines whether the negative or positive pressure of an indoor grow is negative or positive in the majority of situations. It is possible for the garden area to have negative pressure in the garden room if it is expelling air quicker than it is drawing in new air. If the grow area is drawing in air at a quicker rate than it is exhausting it, the garden space will have a positive pressure because of the increased rate of air intake. Growers that utilize grow tents can readily distinguish between positive and negative pressure since they are enclosed in them.

  1. When the tent’s walls are brought inward, the air is evacuated from the tent at a quicker rate than it is being drawn into the tent (negative pressure).
  2. With a tiny negative pressure, the air within the grow chamber is kept confined and contained (except for the air being actively exhausted).
  3. In addition, the negative pressure will keep all of the odor contained within the grow chamber.
  4. In the presence of positive pressure, the odor does not remain confined in the garden and can be driven out of any crack, fissure, or pinhole before it has a chance to be adequately cleaned and eliminated.
  5. Some growers employ a carbon filter or other odor-controlling equipment in a recirculating system to keep odors under control.

A negative pressure system, even when this is established, will always be necessary in order to ensure that all of the odor is trapped and/or neutralized before exiting the growing area.

Establishing Negative Pressure in the Growroom

The most effective technique to produce negative pressure in a growroom is to use an exhaust fan that is far more powerful than the fan that is responsible for delivering fresh air into the garden. It is recommended that the exhaust fan be rated at least 100 cubic feet per minute (CFM) higher than the intake fan as a general rule of thumb for efficiency. For example, if a grower has an exhaust fan that produces 400 CFM, the intake fan should not produce more over 300 CFM. Many growers, on the other hand, have discovered that pairing a powerful exhaust fan with a passive intake is the most effective approach to establish and sustain negative pressure.

Also see: How to Deal with Humidity in a Growroom for more information.

It is theoretically possible to neutralize the stench in the grow space using a recirculating system because this form of growroom never exhausts anything (the air is constantly retained within the room).

The unique glow of horticulture lighting is a telltale clue that you’re in the presence of an indoor grow.

Light Tight Growrooms

Controlling the photoperiod and the amount of darkness in an indoor garden is one of the most ignored and critical aspects of maintaining a good indoor garden. Why is it so crucial to be able to regulate the darkness? The quantity of darkness that the plant experiences in a 24-hour period is really what triggers the blooming response in the majority of photosensitive plants. Or to put it another way, certain plants will not develop fruits and/or blooms until they have had a specific quantity of darkness every day.

  • Many growers, on the other hand, frequently misjudge how black the dark cycle should be.
  • Yes, it is true that moonlight may be seen in the natural world.
  • Additionally, check out 7 Practical Heating Solutions for Your Indoor Grow Any light that reaches the blooming stage of the plant during the dark cycle has the potential to induce the plant to continue vegetative development or, in the case of dioecious plants, to create hermaphrodites.
  • Eliminating light leaks is also a security measure for indoor horticulturists who work in controlled environments.

Wherever outdoor light can enter a growroom, light may also exit back out via the same opening. Aside from the odor, one of the most distinguishing characteristics of an indoor grow’s location is the bright glow produced by horticulture lighting.

Light Tight with Air-Cooled Reflectors

The process of creating a light-tight environment for a normal growroom is not difficult at all. When utilizing air-cooled reflectors, however, achieving total blackness during the dark cycle is sometimes a challenging effort. Air-cooled reflectors, on the other hand, bring air into the garden space from outside the garden space. When the light from the outside source goes via the ducting, it arrives at the reflectors, where it is reflected back into the garden space, as explained above. There are a variety of approaches that a farmer may use to address this issue.

This is effective because light can reflect but not bend, which makes it a good choice for this application.

As a result, the second room may be kept completely black, ensuring that no light enters the ducting.

Serious indoorhorticulturists aren’t only concerned with getting a garden up and running; they’re also concerned with creating the best circumstances for their plants to thrive to their greatest potential.

Aside from the need of keeping their grow facilities safe, seasoned indoor growers realize that the most effective approach to maintain a grow area secure is to ensure that no one is aware of its existence.

In order to ensure that a grower’s indoor grow is kept out of the public’s sight and smell, it is important to create negative pressure for effective odor control and to have a light-tight garden area.

AC Infinity is the most recognized name in air delivery systems, having designed and developed the most cutting-edge breakthroughs in cooling and ventilation technology throughout the years.

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