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How to Set Up Grow Tent Ventilation?

The grow tent allows you to grow plants indoors, and one of the critical aspects that should be of concern is the atmosphere. You would not want to have your plants suffering from too much heat or humidity. The only way to control this is through proper ventilation to keep the indoor growing tent cool.

On this guide, I will show you how to set up a grow tent ventilation, which ensures that the plants get the right amount of heat, humidity, and carbon dioxide, among others. However, I think it would be imperative to understand the essence of ventilation in the tent.

Before you start reading: Are you interested in buying a grow tent fan? My favorite one is Hydrofarm ACDF8 Active Air Inline Fan (Check price on Amazon)

What Is the Importance of Growing Tent Ventilation?

When you have a grow tent, the success of the growth of plants will depend on how well the tent is ventilated. There are many reasons why you should ventilate the gardening tent and here are the main ones:Importance of Growing Tent Ventilation

  • Regulate Temperature:

When you have lights, they will emit heat, and this can alter the temperature inside the grow tent.

With ventilation in the tent, you will be able to get rid of the excess heat that may be detrimental to the plants.

  • Humidity Control:

If the humidity is not controlled, then it means that your plants may not thrive. Ordinarily, plants will produce water vapor, which increases humidity. The ventilation system will control the humidity.

  • Keeps Diseases and Pests Away:

Any grower is worried about pests and diseases affecting their plants. When you have proper air circulation, you will not have to worry over such.

  • CO2 Control:

CO2 is one of the key ingredients for proper plant growth. The plants that grow outside access carbon dioxide naturally. However, in the grow tent, the levels of CO2 keep decreasing.

The ventilation will bring more carbon dioxide from the outside.

  • Helps Strengthen the Stem of Plants:

The plants that grow outside have their stems strengthened by virtue of being with the strong stand winds. The air that is blown by the ventilation system will help the plants inside the tent to stabilize their stems.


The process of setting up a tent is not usually cheap. However, when you get it right, you can be able to grow any crops at any time. As you have seen, there are many benefits that you will enjoy with an indoor plant growing tent that has proper ventilation. So let’s get right into the process of setting up the ventilation inside the grow tent.

How to Ventilate Your Grow Room?

How to Ventilate Your Grow Room

There are several things that go into the setup process of the grow tent ventilation, and I will break them down, step by step:

Ideally, the essential bit of the ventilation system is having the fans and the carbon filter working for you inside the grow tent. You need to have proper ducting to connect the filter and the fans.

Essentially, when you have the fans working correctly, you will control the airflow and circulation. Here are some details that would be ideal.

  • Setting up Fans:

You should hang the fans on the crossbar inside the tent, using rope ratchets. These will help in adjusting the accessories without affecting the plants. There are two types of fans that can be used inside the grow tent as ventilation. These two are:

  1. Oscillating fans
  2. Air Extractor fan system
  • Oscillating Fans:

The oscillating fans are cheap and quite effective. They are known to blow air all around the plants constantly, and this will improve the air circulation in the tent. The setup process of oscillating fans is quite easy, and they give you enough room to maintain your plants.How to Set Up Grow Tent Oscilating Fan Ventilation

When setting up the oscillating fans, you will need to have a number of them, depending on the size of the grow tent. When hanging the fan, ensure that they are not directly on your plants to avoid windburn, which can cause serious damage to the plants.

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  • Air Extractor Fan Setup:

The air extractor is used in the ventilation system as it will take out the oil air and bring in the fresh air. You should hang the extractor fan on the crossbar and ensure that it runs once every 5 minutes, as this is the only way to make sure you have proper air circulation inside the tent.

One of the best air extractors available on the market is AC Infinity CLOUDLINE S4

How to Set Up Grow Tent Air Extractor Fan Ventilation

The best way to have the ventilation set up is when you are setting up the grow tent. You need to check the manufacturer’s instructions as far as the setup of the growing tent goes.

The reason why you should set up the ventilation during the grow tent assembly is to prevent any cases of interfering with the plants.

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See also: Best Grow Tent Fan Reviews and Buyers Guide – Our Top 6 Best Picks

Bring Air into the Grow Tent


You can be able to bring in the air into the grow tent in two ways; either passive or active intake.Preparation of the Carbon Filter

  • Passive Intake:

The passive intake will rely on negative pressure and passive airflow. This allows you to blow air out, but there will be no fan that blows air inside. You will need to create a hole that will allows air to get into the tent passively.

If you choose to use the passive intake system, you should have a hole that is about four times larger than the exhaust hole. This will enhance the effectiveness of the fan and prevent it from overworking. Ultimately, this will give your ventilation great suction.

  • Active Intake:

As the name implies, the active intake system will draw air from the fan directly. This means that there is one fan that blows air in and another one that blows air out of the grow tent. In this case, the size of the intake hole does not matter.

  • Humidity Control:

The other bit of ventilation set up in the tent is to be able to control humidity. You will want to find a ventilation system that will control the humidity levels to prevent diseases.

The process of lowering humidity levels is quite simple as you will need to push the humid air out using the exhaust fan. The dehumidifier is also another accessory that you can choose to have inside the grow tent.

There are other instances when you may be forced to increase the humidity levels. This can be done by sealing off the grow tent and switching off the exhaust fan. However, before doing this, you should have proper research to determine the amount of humidity that is favorable for your plants.

Larger plants will produce more water vapor, and as such, they may have to keep an eye on the humidity levels more often.

See also: 

Best Grow Room Humidifier – My Top Picks

Best Grow Tent Dehumidifiers Review & Buying Guide

  • Injecting CO2:

The final aspect that I will look at, as far as the setup of the ventilation goes, is the injection of carbon dioxide. This is an essential element for transpiration to take place. However, unlike the plants on the outside farms, CO2 levels in growing tents seem to be too low, and this is why you may have to inject it.


The proper injection of carbon dioxide requires that the tent is sealed completely. This will help in attaining efficiency, as you will notice that co2 will only be used when it is highly concentrated. Sealing up the grow tent ultimately will help in increasing the concentration levels of carbon dioxide.

Best Grow Tent Carbon Filters Review & Buying Guide

Secondly, you need to seal off the tent for safety reasons. You would not want to have the CO2 to leak into your home as this can harm your loved ones. Have bright grow lights when you are injecting carbon into your grow tent so that the plants can maximize the on the CO2. Read this Article to know more about how to assemble a grow tent kit.

Final Thoughts:

The process of setting up proper ventilation may sound quite complicated. However, as long as you can understand the different aspects of ventilation, as highlighted above, you should not have too much difficulty. There are so many benefits that are associated with a good ventilation system in your grow tent.

You need to find all the essential accessories to help you with the ventilation system. The carbon filter, fans, and ducting are the key components that you will need when setting up the ventilation.

You should never compromise on the quality of the accessories that you will have inside the grow tent. You need to be keen on the strength of the fan and the filters that you have so that you can create a conducive environment for the plants to thrive in.

If you found this guide useful, please feel free to share it around with others, so that they can learn how to set up hydroponic tent ventilation.