plants like fresh air ...and a breeze makes the stalks stronger....so whether it's exhaust fans or circulation fans I run them for as long as I can w/out causing temperature issues.If I was runnin co2 I would run the exhaust as lil as possible.

Dive:stoned:
Divestoned Reviewed by Divestoned on . fans on timers can anyone tell me how often my fans sould kick on, and for how long? i have a 400 wtt mh in a area about 8x8x8 i have 20 plants and two e-z clone 120 (no clones yet):thumbsup: Rating: 5