I would either add more fans or buy a 4-6 inch inline fan.

You can make a cool tube, but I won't because of the rumors about it wasting lumens/UVB radiation.

The comment about a passive intake and two forced air exhausted is a very good idea.

Having fans on the plants makes the difference though.
ate Reviewed by ate on . hey!! take a look :thumbsup: my cabinet is 4 ft high 2.5 ft wide 2.5 ft deep... 20 cubic ft right? im using a 250 watt hps, the ballast is outside the cab. i have 2 55 cfm fans.. one for intake and one for exhaust.. the temps in the cabinet range from 90-100 and the temps in the room where the cabinet sits are any where from 75-85 and i have no way to cool this room. I was doing fine over the winter but now its warming up the temps are going up... and will only get warmer... do you think that putting a 4 inch Rating: 5