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A stock RV roof vent is basically a skylight for heat — it lets the sun cook your ceiling and lets your conditioned air leak right back out. This insulator drops into a standard 14-inch x 14-inch vent opening and gives that spot some real insulating value instead of none.
Keep one on hand for every vent in the rig — bathroom, kitchen, bedroom — and you'll notice the difference in how evenly the interior holds temperature.