usually not sometimes I have to during the summer.
but I dont use co2 so its more important to replenish the air when the lights are on for me, not so much of importance when they are off if the humidity and temp is ok.
bejay Reviewed by bejay on . exhaust and intake well its my first day of flowering today and i'm just wondering this. once my lights go off the 12 hour cycle do i keep my intake and exhaust fans and desktop fan running inside my grow room? thanks Rating: 5