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Cheers for that - I work it out that my rooms will be of the following volumes; 88.26 cf / 5 = 17.65 cfm (min required) 40.32 cf / 5 = 8.06 cfm (min required) Lol, at that rate i could probably get away with a few computer fans. I here what your saying about having a fan pulling more...

Hello, Can some tell me the equation i need to do to figure out what rating of fan i need to exchange the air in my grow room every 5 minutes. I'm sure there is a simple answer, but I just can't figure it out. Room 1 - 1.14 m3 (meter cubed) Room 2 - 2.50 m3 Thanks P.S Apologies if this has...