H
HighonthePrize
Anybody tried these? I remember reading that round ones don't work so good. I'm thinking of using them for my hydrohuts exhaust, and possibly added intake.
http://www.amazon.com/Pack-Midget-Louver-Darkroom-Black/dp/B00068ZAII
http://www.amazon.com/Pack-Midget-Louver-Darkroom-Black/dp/B00068ZAII