A lot of people have trouble with this while running down the road while on propane. Buy a home style a/c filter at Walmart for a couple of bucks, the size of the refrig outside door opening. You can tape it to the inside of the door. This will keep wind gusts from blowing it out. I have used this for many years on motothomes I have owned and now my Safari. 
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'99 25' Safari
2 Honda 2000i generators
'08 Chevy Duramax
'01 Yamaha Raptor ATV
'07 Yamaha Rhino ATV
2 burgler alarms: Rotweiller and Shepherd
"If you step down to get in, you have to step up to get out"
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Dometic Refrigerator 
Linear Mode
