you need to be exchanging the air in your space at the MINIMUM rate of once every 5 minutes, preferrably every 1-2. without knowing the arrangement of your fans, it's hard to say what specifically you need to do.

fans are rated in CFM, or cubic feet per minute. cubic feet= L x W x H.

keep in mind that you want to be pulling more air out than you are pushing in. you want to create a negative pressure inside your box to get air flowing. if you use a fan for intake and exhaust, you want the fans to move the same amount of air (CFM). keep your exhaust fans up top (heat rises) and your intakes low (cold air stays low).

you might also consider a cool tube. stay away from the CFLs as much as possible as you will be dissapointed in the results (if not now, eventually) and just end up going back to a HID.

welcome to the boards and good growing!


-shake