Here's the deal: I have this closet for my flowering section and everything was fine until i switched from 400W to 600W. I just can't seem to get the temp down where it needs to be. My crops keep coming out a little brown from the heat, and sometimes a couple plants even die. Today I bought another fan, 6" about 270 CFM.

My question is where do I place my inline fans in the run of cooling ducts? There seems to be a great difference of opinion as to wether you should push or pull air through a cool tube or sealed hood. If I remember right, I think it was Zandor who said you should always push the air over the lamp. However I have read many times that you should have your fan after the lamp so it is pulled over it. And where in the run should I put the fans? Right near the light? At the beginning of the run? At the end? Middle?

Arrrgh! At this point I am ready to tear appart my settup and do it over once again. I want to be darn sure that I get it right this time. Oh yeah, I don't know if it makes any difference, but I have a CO2 generator. My 4" run is about 18 or 20 feet total. I plan to use the fan that I bought today, and a 4" fan, about 175 CFM. I am pretty sure I have enough sucking/blowing power now. My intake is near the floor in a differnt room which stays about 81 degrees in the summer. The run before the lamp(which is in a sealed hood), is about 6 feet, and the rest is of course is after the lamp which exhausts to the outdoors. There are two 90 degree bends before the lamp and two after. Please don't tell me I need the entire run to be 6", because the area of the intake will not allow it.

My initial thought on this to put the 6" fan right before the light, and the 4" inch fan near the exhaust opening. Any thoughts on this would be greatly appreciated, especially by HVAC experts.
Opie Yutts Reviewed by Opie Yutts on . Ventalation: fans fans fans fans...? Here's the deal: I have this closet for my flowering section and everything was fine until i switched from 400W to 600W. I just can't seem to get the temp down where it needs to be. My crops keep coming out a little brown from the heat, and sometimes a couple plants even die. Today I bought another fan, 6" about 270 CFM. My question is where do I place my inline fans in the run of cooling ducts? There seems to be a great difference of opinion as to wether you should push or pull air through Rating: 5