Delta FFB1212EH-F00 is what I use in 4 of mine, work great. Speed: 4000 RPM, Noise Level: 56.4 dBA (max. 60.4 dBA), Air Flow: 150.33 CFM, 12.43 mmH2O, 0.489 inH2O
Note: Some of these fans come bare wire style and you have to crimp your own ends on. I found a really good price of them elsewhere only to learn after I ordered 12 of them that they were bare wire.