Skip to main content

Required Air Exchange

Use this calculator to determine the minimum air exchange required in cubic feet per minute (CFM). This calculation might be different at each stage of growth.

ft
ft
ft
cu ft
CFM

Helpful Blogs on Growing

Frequently Asked Questions

Why should I use this calculator?

Proper air exchange for growing weed is crucial for the health of your marijuana plants. Use this grow room air exchange calculator for growing marijuana. Use it to calculate the volume of air, in cubic feet, that must be moved around your marijuana grow room every minute. Use the results to decide the type and number of fans and filters to install in your grow room for optimal airflow.

Sign up for the Cannabis Growing Pro Certificate Program to learn more about cannabis grow room air exchange and buildout.

Does a marijuana grow room need fresh air?

Fresh air is crucial to your indoor cannabis grow room. It keeps the CO2 content at optimal levels for the plants and stops air stagnation that can attract pests and cause diseases.

Sign up for the Cannabis Growing Pro Certificate Program to learn more about air flow in your indoor marijuana grow room.

Will pumping CO2 into my grow room affect the fresh air?

Yes! Adding CO2 to your marijuana grow room will increase the air exchange for growing weed requirements, so you’ll need to use more fans. No worries, though! CTU’s air volume CFM calculator accounts for several grow room environmental factors, including CO2 enrichment, lighting, carbon filter use, outdoor temperature, and outdoor humidity.

Sign up for the Cannabis Growing Pro Certificate Program to learn more about how environmental conditions affect the airflow in your cannabis grow room.

What is CFM?

CFM stands for Cubic Feet per Minute. It is a measurement of the volume of air (in cubic feet) that a fan can move in one minute of time. CFM is the standard term of measurement used when talking about how much air exchange for growing weed is needed in a marijuana grow tent or cannabis grow room.

To learn more about CFM, sign up for the Cannabis Growing Pro Certificate Program.

How much air exchange does my cannabis grow room need?

Your fans should completely replace the air in your grow room at least every 5 minutes. For example, with a 5’ x 5’ x 5’ grow tent, you need to exchange 125 cubic feet of air every 5 minutes. The requirement increases when you add heat, CO2, humidity, or an air filter.

For more information on marijuana grow room air exchange for growing weed, sign up for the Cannabis Growing Pro Certificate Program.

Read more

Explore All Calculators

A hand holding a book titled "Cannabis 101", delving into the art of growing Cannabis 101.

FREE E-BOOK

GROWING

10 Grow Tips from Professionals

Pick the right strain, lights, and more!

Title: The Green Rush: A Free e-Book Guide to Growing CannabisDescription: Dive into the world of cannabis cultivation with The Green Rush, a comprehensive and informative e-book. This must-have