Cannabis Ventilation: The Best Cannabis Grow Room Ventilation Guide

Cannabis Ventilation

Indoor cannabis growers would be wise to pay special attention to ventilation. Reduced growth, illness, and pest infestations are all possible if your plants lack adequate air circulation.

Here, you’ll learn everything you need to know about setting up a functional ventilation system in your cannabis grow room or tent.

The Importance of Ventilation in Growing Marijuana

Photosynthesis Means:

The process of photosynthesis, through which plants convert ambient light, water, and carbon dioxide into food, requires oxygen from the surrounding air.

To Breathe:

Plants use the oxygen and glucose they’ve taken in during photosynthesis to power their development through a process called respiration.
Your cannabis plants will starve to death if they don’t get enough oxygen. However, before this can occur, your grow room will become a haven for pests and diseases due to a lack of adequate ventilation.

Stale, heated air accumulates around your plants without ventilation, creating a hot, humid atmosphere that is conducive to the growth of numerous pests and diseases.

Comprehension of Ventilation for Growing Spaces

The ventilation process is often a source of confusion and anxiety for first-time cannabis growers. However, the fundamentals of ventilation in your grow space are uncomplicated: remove stale, humid air from your room/tent and replace it with new, cool air from outside.

Maybe you’re reading this and wondering what makes the air in your tent/room get so hot and muggy. Let’s dissect this sentence:


Cannabis Ventilation

In a purely organic process, cannabis plants (or sweat). Plants rely on this mechanism to transport water and nutrients from the ground to their stems, leaves, and blossoms.

Cannabis plants develop a pull that transports water from their roots to the rest of the plant by transpiring through the stomata and cuticles in their leaves and lenticels (pores present in exterior plant tissue such as stems). Your grow room’s relative humidity will rise when water vapor from plant transpiration mixes with the air.

Also Read: How to Buy Medical Cannabis Seeds: Check out Best Seed Banks to Order Cannabis Seeds

Heat From Plant Grow Lamps

The heat produced by grow lights is a universal fact. Even though newer LEDs are more energy efficient, many farmers still choose traditional HIDs (metal halide, high-pressure sodium, or both) for their increased yields. Your grow lights will cause your tent or room to get too hot if you don’t have enough airflow.

The best way to maintain ventilation in your grow area is to install an exhaust system that vents warm, stale air from the top of the room or tent and brings in cooler air from the base of the grow space via the plant canopy. It’s also possible to utilize basic fans to circulate air, though their effectiveness will depend on the size of your space. If you want to learn more about extractors and fans, read on!

Essential Tools for A Better Ventilated Grow Room

We’ve compiled a list of the fundamentals for ventilating your grow room.

Expeller Fan

By removing stale air from the growing area, extractor fans ensure optimal conditions for plant growth. Since warm air tends to rise, the best place to put the extractor is towards the ceiling. You can install an exhaust system to some varieties of grow lights or reflectors.

It’s important to remember that there are numerous extractors to choose from and that the strength of your extractor should correspond to the size of your grow room. Indoor extractors’ capability is commonly expressed in cubic feet per minute (CFM). Find out how many cubic feet per minute (CFM) of airflow you’ll need to adequately ventilate your grow room or tent.

Recognizing CFM

Multiplying the dimensions of your grow room or tent’s base, width, and height will give you the total volume (ideally in feet). Consider the following example calculation for a standard 4′ x 2′ hobby grow tent:

A minimum of 40 cubic feet per minute (CFM) of exhaust airflow is recommended for a tent of this size. You should choose a fan with a CFM that is at least equivalent to the volume of your tent or room. This will guarantee that your grow room’s air is being replaced completely at least once per minute by your fan.

You may use this converter to convert from cubic feet per hour to cubic meters per hour.

Purification System with A Carbon Prefilter

The purpose of a carbon filter is to remove pollutants from the air. They remove contaminants from the air you pull out of your grow area and when connected to your exhaust system, they also soak up the terpenes your plant release. Activated carbon filters are excellent at removing the odour of the cannabis grow room since carbon is so dense (a single gram of activated carbon has a surface area of 3,000m2).

Rotating Blades

The final component of a functional ventilation system is oscillating fans. Despite their low price and seeming lack of complexity, strategically placed fans can help improve air circulation throughout your grow area. The fresh air will not only aid your plants by strengthening their stems, but it will also help avoid the buildup of pest- and disease-carrying stagnant air around your space.

Making a Decision Between Passive and Active Consumption

Cannabis Ventilation

The term “air intake” is used to describe the means through which air is introduced into the cultivation space. Vents and other openings in the structure’s envelope are used for passive intake. As opposed to passive intake, which relies on windows and doors, active intake uses a fan to actively draw air into the grow space.

This is the most effective method of ventilation since it promotes substantially higher air circulation throughout the grow chamber. To create a negative pressure within your room/tent, the CFM of your intake fan should be lower than that of your exhaust fan.

Also Read: Sativa vs. Indica: To What Extent Do Different Cannabis Strains and Types Differ?

The Role of Negative Pressure in Flight

Our objective as indoor growers is to simulate natural circumstances as closely as possible so that our ladies can flourish. In order to better control the atmosphere in your grow tent and provide your plants with the best possible airflow, you should measure the air pressure there.

The air pressure in your grow room should be negative, which means that more air is escaping from the room than is entering it. This will allow you greater control over the room’s temperature, humidity, and carbon dioxide levels, as well as reduce the smell of your grow (since stale air isn’t being trapped inside the room).

A Variety of Carbon Filter and Extractor Setups

There are a variety of ways to set up a system with an extractor and a carbon filter, all with the end goal of preserving plant health and reducing odors. First, let’s weigh the benefits and drawbacks of each potential course of action.

Exhaust system > Carbon Filter > Extractor

As far as I can tell, this is the most popular method for installing a fan, filter, and exhaust system in a grow tent. By placing the carbon filter at the very first point of your exhaust system, you may purify the air before it is exhausted through your vents.


Before entering your fan, the air is filtered to remove harmful particles from the air.


Not ideal for use in confined spaces like tents or hotel rooms due to its large footprint.

Exhaust System > Carbon Filter > Lights > Extractor

This is for those cultivators who use lights with sealed ventilation systems. Always install your filter first, followed by your extractor and exhaust fans, and then your grow lights.


Allows for a neat and simple exhaust installation.


These fixtures are only compatible with grow lights that have sealed ventilation systems.

Carbon filter > exhaust > extractor

Some cultivators choose to put their filters at the very end of the pipe that vents the greenhouse. This way, before it is blown outside, the air in their room/tent has been cleaned.


The carbon filter may be set up outside the grow room or tent, making it a good option for growers who are working with restricted quarters.


It draws in potentially harmful tainted air and blows it via the fan.
If you’re wondering whether to put your grow tent’s extractor fan inside or outside, read here.

This is a typical inquiry from inexperienced gardeners. When possible, it’s best to keep the grow tent’s exhaust fan and other components inside of it, where their noise may be contained.

However, if you’re short on room inside your tent or find it difficult to deal with the heat, you can always set up your fan outside. It is critical that your exhaust system be airtight regardless of where you decide to install your extractor.

Optimal Ventilation for A Grow Tent

Many people who cultivate plants indoors do so in special tents. Fortunately, most up-to-date grow tents feature openings or ports for a ventilation system. Following are some of the fundamentals of putting in a grow tent exhaust system.

Install the Exhaust Fan and Filter

You should put in your carbon filter and then your exhaust fan. Because it can be difficult to properly vent your grow lights, we advise you to do so before you set up your lighting.

Put in Your Plant Lighting
Following the setup of the filter and fan, the lights can be hung using rope ratchets.

Methods for Adequate Ventilation of A Miniature Garden

Micro-growers that only have room for one or two plants in a closet or cabinet can use a very basic ventilation setup. In fact, ventilating a micro-grow can be done for next to no money.

Opening a window near your tent/cabinet/wardrobe a few times per day, and utilizing oscillating fans as necessary, can be enough to properly ventilate your grow.

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