Since you generally have a problem with heat due the the heat output of the lamp(s), your exhaust should be as high up as possible....since warm air rises. The intake on the other hand should the the coldest air you can get which would be as low as possible.

keylime
keylime Reviewed by keylime on . passive air intake vents ? where is the best place for the passive air intake vents? i have a romm , 5x13 split into 2 rooms , veg 5x5 and flower 5x8 , i plan on to share the output fan, bewteen the rooms, and was wondering ,about how large do the passive intake vents need to be? and should i put them in the waLLs? or use the ceiling in between the rafters? , Rating: 5