How to Set up Grow Tent Ventilation – A complete Guide

Technology has changed the face of gardening paving way to more people to give a shot at growing plants. In particular, a grow tent has lots of advantages with the obvious one being having an endless growing season. In a grow tent you also able to monitor in close proximity, the progress of the plants. A key factor is however overlooked; ventilation. In this post, we shall provide a step by step guideline on how to set up grow tent ventilation.

The rise of grow tents

A few decades ago, when the word farming was mentioned what came to most people’s mind was a large plantation, farmed by tractors. In the modern society, people are of a different opinion. The invention of grow rooms and grow tents proved very useful due to the simple fact that they provide convenience in gardening.

Grow rooms can be set indoors and you don’t have to wait for the seasons. You are good to go anytime anywhere guaranteed of high yields.

Why you need ventilation?

Before we walk you through a guide on how to set up ventilation for grow tent it would be unethical not to first explain why ventilation is important in the first place. From basic third grade science, the three conditions for plants to grow are air, water, and nutrients. There is no ventilation in the list, why is it so important in a grow tent set up?

Reduce heat

When plants are grown outdoors there is a smooth circulation of air. Under very rare circumstance will it get uncomfortably hot, even when it does; most plants tend to adapt growing in a given habitat.

The same cannot be said about plants grown in a grow tent. To begin with, artificial lights are used most of which generate heat. Being an enclosed area, it can get too much. Some of the consequences of too much heat in a grow tent are: discolored leaves, wilding and worst-case scenario death of the plants.

Good ventilation will help maintain optimal temperature conducive for the growth of the plants.

Control humidity

What is humidity? This is the ability of air to hold water. Different plants vary when it comes to humidity level requirements for optimal growth. Through the process of transpiration, plants lose water taken through the roots on tiny openings in the leaves called stomata.

The water builds up in the air raising the humidity levels. Well, there is nothing wrong with this. Air has a saturation point in which it cannot hold any more water. What will happen in such a case? This will affect transpiration hindering plant growth.

With a good ventilation system, you are in a position to regulate humidity levels in a grow tent. For maximum yields, optimal humidity levels should be maintained.

Control pest and diseases

One of the main advantages that a grow tent has over outdoor farming is easy in which pest and diseases are controlled. Most pests and diseases causing organisms thrive well under humid and hot temperatures. Setting up an effective ventilation system is a major step in controlling pests and diseases in a grow tent.

Strengthening the stems of the plants

This sounds rather off point but yes, a good ventilation system will help strengthen stems of the plants. How is this even possible? Plants grown on the open are subjected to wind. Well, did you know that wind helps strengthen the stems of the plants?

In a grow tent setting for instance, as the fan rotates there are some cool air currents emitted. This gives a similar effect to the wind. Minor but still crucial.

Prevent the buildup C02

During the day, in the presence of chlorophyll plants use CO2 to make their own food in a process called photosynthesis. At night, a reverse process takes place where the plants take in oxygen and excrete C02. After some time the carbon dioxide will over accumulate in the tent and this can affect photosynthesis.

Setting up a ventilation system helps solve this problem but not only sucking out the carbon dioxide but also purifying the air.

Basic notes when set up grow tent ventilation

Most people are bound to make mistakes when setting up the ventilation system in a grow room. Here is a checklist of things you should be on the lookout for:

Size of the grow tent

You should know the size of the grow room to determine how many fans to purchase and the type of ventilation system to install. The bigger the grow tent the more the fans required.

Plants to be grown

Some plants have an odor. For instance, if you are growing cannabis in the store, it doesn’t mean that you want everyone who walks into your house to know the little secret. In such a case a well elaborate ventilation system that includes a filter should be set.


Of course, the price had to be a key factor since you can’t purchase what you can’t afford. However, never sacrifice quality for a low price. Follow this slogan and you will always be on the positive side.

Guide on how to set up grow tent ventilation?

Here are the basic principles you should know about installing ventilation in a grow system. Two fan systems are needed:

  • Air extractor fan system
  • Oscillating fans

1. Oscillating fans

These are just typical fans. Most of them are cheap but effective. The main role of oscillating fans in a grow tent set up is to improve the circulation of air. The fans are designed to brow air in all directions. The size to go for will depend on the size of the grow room but this should be something between 6-12 inches in diameter.

Oscillating fans are easy to set and requires little to no maintenance. Ideally, you can set two fans; one to blow air from the top and the other from the bottom.

2. Air extractor fan system

Fans alone are not enough. The air needs to be purified, extracted and fresh air brought in. How can this be achieved? Through air extractor fan system whose prime purpose of to cycle old air paving way for fresh air which is ideal for the survival of the plants in the grow room.

Passive air intake

The passive air intake is the process by which air is brought into a grow tent relying on the law of negative pressure and passive airflow. In a passive air intake setting, the fans only extract air. To let in fresh air, a ventilation hole has to be made on the grow tent.

Active air intake

In this setting, there are two sets of fans. Extracting air and the other set blowing air into the grow tent.

3. Carbon filter

Carbon filters are essential in just any grow room irrespective of whether you are growing cannabis or not. The carbon filter helps purify the air, eliminate bad odor and air-borne pathogens that might be harmful to the plants.

General set up:

  • Set up the fans. To determine the strength of the fan calculate the volume of the grow tent (Length × width × height) multiply by the exhaust efficiency.
  • Set up the air extractor fan system. This should be set near the corner of your choosing.
  • Some air extractor fan systems have a carbon filter. If the model you are using doesn’t; buy and install it.

Final verdict

There you have it on how to set up grow tent ventilation. There is no need to call a professional. The truth is, with this guide you are an expert at your own caliber.

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