I'm planning on using a hepafilter over a hole somewhere.
Atach a duct to it.
And run it to the floor.
That way the negitive pressure will suck the fresh air in from OUtside or another room.
We'll see how the place is built.
Jdog7000 Reviewed by Jdog7000 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