like your avatar. I base on whether I use my fan after lights off exactly as twoguys said.....if the space is hot or humid, then I would leave it running 24/7.
Weedhound Reviewed by Weedhound on . extraction. should both my intake and outtake fans (100mm-125mm rvk fans) be running 24/7? at the mo the out take fan is on 24/7 but intake only comes on with the light. w.i.k edit. i have a 1x1x2m bud box grow tent. and a 400w hps. Rating: 5