Im going to have an exhaust and an intake.. i dont know much about this stuff but anyways do i need 2 fans? to pull air in and 1 for sucking air in?The way to figure it out is l3xw2xh6 = 36 cubic feet in your room.
A fan cfm is cubic foot a minute so a 36 cfm fan would clear your room in 1 minute.
Then depending on if you are using an intake and an exhaust or just one.
Anyways i think anything over 100 cfm would be good.
I would run it for 2 minutes to help with the heat from the 4oo watt.
Are you gunna vent the 400 watt.
Imo the more air the better. Were is the intake air coming from.
I would suggest a 100 cfm or higher intake blowing in air.
And a 100 cfm for exhaust.
The exhaust should be uo near the top and the intake near the floor.
That's a good thing.If i put the intake on the floor.. its going to be strong on my plants..