So I am designing a small dresser grow box. I plan on using CFLs for veging, then switching to HPS with CFLs to supplement durring flowering. To work out the ventilation I went to the GrowFAQ:
GROWFAQ
There, Using the formulas in the post, I have an inside temp of 76 degrees, and I plan on at max using 200 watts (150 for hps, 23 for cfls, and a few extra for buffers (running fans and whatnot)). Which means I need around 125 CFM moving. I got two of these:
Cooler Master 120x25mm Dual Ball Silent Fan (Y720CCD-25K1-GP) - 109.6CFM - FrozenCPU.com
Both are rated at 110 CFM, so I hoped to dial them down a bit and cut back on sound. I use passive intake on the bottom that goes through 90 degree angle in order to work as a light trap. When I turned it on to get a temp reading, with both fans working at max cfm, I was still getting temps around 85 degrees inside when the room is about 70 degrees. This poses a problem because I was only using 100 watts of CFLs. So I cut more holes in the bottom to create larger passive intakes, thinking this was the problem. It hasn't solved it yet. Temps are still 15 degrees above the room temps with only 100 watts of CFLs in there. How can I cut the temps down?
I can't make the intakes any larger without breaking the light trap, but do you think this is the problem? and if so how do I fix it?
Do I need higher rated fans?
Please help guys. Look over the pics, I know they arn't the best but ask if it isn't clear. Thanks