The other thing those vent covers do is to help protect the factory covers. They are rea suspetical to uv rays. Last November we got to a campground and opened the bunk room door and it was wet the cover just went to pieces going down the highway. Thank goodness it happened on the way out, and not going back to the storage yard
Frank and Janet Henn
2017 380MBH pushing a 2007 Dodge
CDT with a six speed Automatic
Traveling with Hoover and Rainbow the wonder dogs and now with Sunshine the rescue Schnauzer.