Not my intention to hyjack ur thread AmazingBlazing, but since my room dimensions are almost identical (4x5x6) and i also use a 400w hps, i take this chance to ask if having an extraction fan is really important considering that my growspace is part of a toolshed that doesnt heat up that much and the doors are opened frequently????And i will have a fan inside do move the air (just to simulate wind conditions)..once again sorry to step in AB....
OmegaVermelho Reviewed by OmegaVermelho on . desired CFM for 4'X4'X7' w/ 400 watt? well the title pretty much sums up my question. For a room that is 4 feet by 4 feet by 7 feet and runs 400 watts of lighting, what would be the desired CFM? Rating: 5