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as for the size i had to build it out of a piece of furniture i already had. i love the idea of having a fan blow better air to the intake. will go get a fan for that tonight. and for the 6" out 8" in, i assume you mean square inches?

so first off i managed to get the ambient temperature around my box down to about 76 (was ~86) and i also increased the size of my intake. went for a 1.5 inch circle to ~ 6" x 4". now my inner temp is about 85.5 when the light has warmed up. i realize that 85 is definitely acceptable for...

Can anyone back this up? Or cintradict it?

Is there really a big differance between a 4" vent fan and a 4" pc fan with the same cfm rating? I wouldnt have a problem switching it to a vent fan if there is actually a diferance

I could definitly add a bigger exhaust and widen the intake. The bigger air scrubber filter i would need to make for flower time would be a bit of an issue tho. Cant have that smell coming out too much. Also i havent found any good information on intake size. All ive seen is "use a passive...

I am starting my first grow and have some temperature issues to deal with. Box info: I have built a (mostly) stealth box 18" x 18" x 45" (~ 8.5 cubic feet). I am using THIS 180W LED grow light. choose LED for minimal temperature & power. I have a small passive intake hole and a 120mm 100-CFM PC...