with an 8" exhaust and only 1 4" intake the air is gonna be whipping through like a wind tunnel and humidity wont have a chance to rise. need air intake atleast the same size as exhaust. 8" out means need min 2 4" intake.
tinytoon Reviewed by tinytoon on . MAJOR Humidity issues....plz help! This is my first grow...here is what I have built in my garage: 4x2x4 grow box, 400w hps (approx 1.5 ft from plants), 8in diameter exhaust fan sucking air out, 4in diameter inlet coming from the front of my house which faces the beach(cool dense air), 8in circulating fan inside grow box, 6 plants total (all under 8 inches). My temp range is 60-85, but my humidity ranges from 13%-20%. I have tried wet towels in the box, trays of water, putting plastic domes over plants, misting ( the mist Rating: 5