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hello relativewook - with your 250W HID - did you keep the ballast in the box or outside of it? I'm concerned about the heat a 250W would generate - but, wondering if using a remote ballast would help considerably with heat? Also- what size CFM fan did you use? DO you have a carbon filter...

how many CFM is your 4" fan? Your dimensions are close to what I plan to build. I too will use 250 mh/hps. Concerned about the heat - 85 is somewhat hot - no?. What is your ambient temps? That is, the temp outside the box? I will be growing with 61 ambient temp - so hoping the 250W will...