Air Exchange

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Air exchange in a grow room helps keep the temperature down and regulates Co2 levels. A high powered fan blowing outside will cause an opposing vent across the room to suck in air.

air exchange,exhaust fan But how do you know the power of fan to get and just how do you know when the room has had a complete air exchange?

Fortunately there is a formula to determine this. First we need to find the CFM or 'cubic feet per minute' of the grow room.

Determine this by multiplying the length of the room times the width times the height.

This calculates the CFM to exchange air in the grow room within 5 minutes since air should be exchanged at least every 5 minutes and more preferably every minute.

Take the 5 minute CFM and divide by 5 for the 1 minute CFM. Example: Room is 10 by 10 and 7 feet in height which is a CFM of 10x10x7=700

So a fan rates at 700 CFM will exchange the air in the room every 5 minutes. Divide 700 by 5 = 140 CFM to circulate the air every minute.

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