I agree. The signature ultra lites are in the Windjammer family and my fan sounded like a loud whine and would come on for a long time. This is to help move air across the coils and push it out when the temps rise enough to trip the thermistor mounted on the top cooling fins. The fan is located and mounted approx half way up the rear of the cabinet. Do yourself a favor and replace the fans with a quieter fan. I put four 12 v super quiet fans in and now you have to put your ear up to the outside cabinet I. Order to tell if they are running. I wired them through the thermistor so they will only come on when the temp rises to 125 degrees in the back. The combined current draw of the four fans is less than half of the factory fan which is 3 amps.
2014 Windjammer 3025W Diamond 34.5 ft 8300 lbs.
2010 F150 SC XLT 4x4 5.4L, 3.55 gears 20" rims
12 k Equalizer WDH, Firestone Airbags, HD Bilsteins
TST 507RV TPMS