Those Industrial Noctua's NF-f12's come in 2000 and 3000 rpm versions with the 3000 version moving ~160CFM. The regular nf-f12 is 1500 rpm and 52 cfm, the 2000 rpm industrial is 71cfm
They have ones which are IP 67 rated too so Dust proof and water proof upto 1 meter depth
http://noctua.at/en/products/fanI removed a 72cfm fan pulling air through my condenser and used a 1500 rpm nf-f12 (53 cfm) Pushing air through it and compressor duty cycles decreased instantly along with noise and Amp draw.
Noctua really makes a nicely engineered fan.
