best seller! strap for easy removal removable cover insulate your roof vent opening to keep heat and light mylar-backed shade blocks most light from rv roof vents opens to 14" x 19" cause cancer and birth defects or other reproductive harm lets air in or blocks it off to cause cancer and birth defects or other reproductive electronic ignition • vent assembly included • low 4.5 amp draw • ducted or direct discharge series furnaces maximum heating performance in a low-profile design exterior vent cap with gasket sealed exhaust members reg tube and side room air duct collars sf-q series members reg heavy-duty park model new suburban furnace cores available protect your furnace and fan unit from flying maintain your rv