I watched a video some time ago where a couple got annoyed from the cover flapping in the wind while driving their motorhome. They removed the microwave / rangehood, installed a 12 Volt electromagnet in the wall opening wired to an on/off switch near by and a steel fender washer on the flap. 'On' energizes the magnet and pulls the flap shut, 'Off' allows the fan to push it open. You might be able to do the same if you're willing to go through the hassle involved with pulling the rangehood.
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2018 RAM 5500 Laramie CC
Sold: Riverstone Legacy 38RE, 960 Watt Solar, 6x6 Volt AGM Battery Bank, Freedom SW 3012 Inv/Charger
Ordered: 2021....
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