He could try a 4", but if it doesn't work, then he's stuck buying the bigger one and stuck with the small one. Like the might Zandor says "if you go cheap, you grow cheap"

LoL, kinda like confucious.
dusto2k3 Reviewed by dusto2k3 on . new grower seeking advice sup guys,,, i have a Q for ya'll a buddy of mine just bought a HydroHut, the original size (52" x 52" x 7' tall) it was kind of expensive so i'm lending him my air cooled sun system reflector my Q is.. what size extractor fan should he get so that it will effectively pull air thru a carbon filter, thru the hood, and out the top of the hut??? Rating: 5