T tweezy Active Member Aug 4, 2009 #1 for a box with roughly 20 cubic feet of air space, how big will i need my intake and exhaust fans to be? growing under 150w hps. i figured 100cfm for exhaust, but how big of an intake would i need then?
for a box with roughly 20 cubic feet of air space, how big will i need my intake and exhaust fans to be? growing under 150w hps. i figured 100cfm for exhaust, but how big of an intake would i need then?
