Some grow box questions

[Lawpb7]

So here's my grow box I built last week. 4x4.6x8 (the inside still needs to be painted flat white)
I'm using t5 hos for vegging and a 600watt hps for flowering
http://i182.invalid.com/albums/x164/ego_pballa/awerewer.jpg
http://i182.invalid.com/albums/x164/ego_pballa/aa.jpg
http://i182.invalid.com/albums/x164/ego_pballa/a.jpg

1) Would a valuline 6in 435cfm be adequate to pull air throughout my light and carbon filter? Then push it through my window?
http://www.horticulturesource.com/c...4894/?osCsid=4a74f1abc3cd6c9e92e32fd8e04f408f

2) Or should I use a 12 in valuline with supposedly over 1000 cfm or an 8 in with 745 cfm to be on the safe side? Will reducers effect air flow? Which one of the 3 would you use? Pros/cons?

3) should I use booster fan or passive intake? Why? How big of a booster fan? How big of a passive intake hole?

4) Also is this fixture high output? It says HO in the title But not in the details
http://www.businesslights.com/tcp-e...tivolt-prs-high-bay-fixture-qship-p-2316.html

 

[Spuzzum]

You're basically just exhausting the heat from the bulb before it gets a chance to build up. As long as cooler air is constantly pushed/pulled through, the hot air will be removed and exhausted. Cabinet I had, was 18" x 30", with a 250w hps. Since I couldn't find a hood that was 18" or less wide, I needed to build my own.. wood, picture frame, glass, and 5" muffin fans. You could set up a 2-fan scenario, with a fan pulling through the filter, then have another fan at the other side of the hood to pull as well. I had mine set on a dimmer switch and ran both at 1/2 speed.. reduced the noise.


By the way.. I like that hood.. what's the dimensions? :D