Mine has them and if I listen closely I can hear them running when I'm standing at the opening outside the motorhome. I've though about using incense sticks to see if they were working, go to the outside opening behind the refrig, light sticks and put it in the opening and see if the fans suck the smoke up.
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Sonny, Anita and Phoebe
2005 MADP 4304, 2005 Ford Crew Cab F150 toad, 2009 Harley Ultra Classic
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