How To Calculate Your Fan Requirements

Extraction Fan FAQ:

Please Note:
North Americans measure extractor fan size in CFM (Cubic Feet per Minute)
Europeans measure extractor fan size in M3/H (Cubic Meters per Hour)

Q: How do I know which extraction fan I will require for my space?

A: To know what size extraction fan you will need requires you to first calculate the volume of your grow space (length x width x height) using either feet for CFM (Cubic Feet per Minute) measurements, or using metres for M3/H (Cubic Meters per Hour) x 60 (x 60 for calculating per hour on meters only).

Once you have calculated your grow space volume, you then can see the exact the capacity of your grow space that needs to be refreshed once per minute on average.

For example: If you have a 1.2m x 1.2m x 2.0m grow tent, you will calculate the following: (length x width x height) = Cubic Meters

1.2 x 1.2 x 2.0 = 2.88 Cubic Meters

2.88 x 60 = 172.8 M3/H (Cubic Meters per Hour)

A fan with the capacity / airflow rate greater than 172.8 M3/H will be required.

The ISO-MAX 150/410 Silenced Fan will cover the requirements of this grow space with additional airflow over the 172.8 M3/H minimum requirement, allowing the grower to run this fan at a lower speed setting since 410 M3/H is the fan's maximum output.

Note: There is many additional factors that will need to be considered when calculating precise fan and room capacity for extraction, such as heat, filter efficiency drop, age of equipment and more.