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ah yes. should i use one fan or two venting out? well the 4" inline moves 170 cubic feet per minute. what we want is total air exchange every five minutes. so first get cubic feet of flowering cab and then see if one or two fans will suffice. remember that the filter will reduce that 170 cfm to...

as far as mylar goes: one it is expensive. two it tears easily unless you get 4 or 6 mil and if you do buy 4 or 6 mil, see answer one. three if it gets water spots on it (which it will) it reduces reflectivity by a LOT. and four it is just a pain in the ass to use. i would suggest flat white...

the 4" vent booster fan should be enough to cool the light but i would suggest at least one inline (not booster) fan blowing out (two would be better) with a passive non fan intake hole at the bottom of your cab. your space is too small for just the booster fans to effectivley vent the space...