cut a hole in the floor,have a air blower in the hole ,blowing in cool air from under house..have.a drop ceiling in closet,took out all tile...exhaust goes in attic, its dialed in nice...2nd grow in full swing...5 autos,4 nice photos ready for flip when autos done...o yeah!!!!!How is the summer treating you in that space? Air cooled hood was a good choice.. without it, I couldn't see a 600 in that closet working. Even a 400 would make for a sauna