smallarmsfire

if you're going to be extracting a lot of air from the tent (ie if your lamp wattage requires an inline,) you will likely create a negative pressure zone inside.

unless the walls are very sturdy, you will be surprised at how the negative pressure will affect the integrity of your "tent" by sucking in the walls to a varying degree..

saw a brand new model of a GrowLab the other day, and the 4'x4' space was reduced to a 3x3' by the sucked-in walls, just from a 6" inline pushing into an external filter. it would have been even worse but the guy had an interior "boxing ring" trellis setup that was supposed to be for training his table, but instead was serving to keep the tent walls from collapsing inward even more. he had 4 passive 6" intakes opened up (slick feature on the tents is the ease of intake/exhaust placement,) but it wasn't even close to enough to keep the pressure balanced.

I guess what I'm saying is.. if you use a flimsy structure, you definitely gotta run the light on it's own closed duct run if you're doing air-cooled, and just do a minimal air exchange for the tent atmosphere with a cheap$$ duct booster or something.

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