hmm

if your ambient temps are high then you arnt going to be able to cool things down too much with passive cooling, you need to cool the room down somhow, or draw cool air from somwhere..

the only benefit to blowing air through the cool tube ( as opposed to sucking it out) is; its easier on the fan bearings, so your fan will last longer
babystarbud Reviewed by babystarbud on . AAAARRGGHH!!! I DONT UNDERSTAND! I've just completed one grow in a 1.2m * 1.8m closet, its 3m high too. I had to keep the door open, and with just a dinky little fan blowing on them from the doorway, they managed to stay at about 27C all the way, under a 400w HPS. For this grow, I decided to do things a little better. I smacked out a 12 cm round exhaust hole at about eye level and a 10cm intake at roughly floor level. I inserted the 12cm flex ducting, pulled it all straight and inserted it into my brand new fan which I've Rating: 5