34 Blues I had the same problem with space and went with dual flex-a-lite fans that put out 3500 CFM and my 37 runs at 180 degrees all the time. When I'm stopped for a period, I have my fan set to come on at 200 degrees and in about 30 seconds it shuts off after reaching 180 degrees. Works great but if I had the room, I'd go with a puller fan.