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In my old trailer, I used blocks of foam cut to size to fit the opening of any vent I wanted to cover. They just push up into the holes and stay there by themselves. Easily removed and stored. In our hot Nevada summers, I leave them in all the holes when we are not using the trailer and it helps cut the heat build up in the trailer. Our fabric store also sells foam and cuts it to size. JoAnnes has foam, but you have to cut it yourself, but our Mill End Fabric Store sells white or blue foam for mattresses or any other use you want and cuts it for you. I used 3" foam in the 14x14 holes, and I think 1 or 2 " foam for the shower. It will also block the light well for sleeping.
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