Heya Bree

I use a Panasonic Whisperline fan for odor control/light cooling - 6" duct 340 cfm, passive intake. Not the most powerful fan but I wanted something super quiet. I also have an oscillating fan in there for agitation

How big is your room/ what are your ambient temperatures? I'd guess at least 350 cfm - but the more the better. Dayton makes a nice 465 cfm fan, loud though. Although that 4" duct kinda shoots you in the foot as soon as you neck down a larger fan. What kind of budget for a fan do yas have?