I used a pair of computer muffin fans mounted under the refrigerator vent cover on the roof. To reduce the noise (and reduce the current) I fed them through a resistor. I also used a 100 degree thermal switch attached to one of the tubes. The fans only run when the temperature calls for it.
Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.