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Fend off wasps, mud dauber nests, birds, rodents and squirrel. Simple and inexpensive way to guard your vent and protect insects from getting in, while not restricting proper airflow on the openings. Caution before ordering Please check the make and model of your RV and furnace system carefully to ensure the product is a good match before ordering and installing. Wasps, mud daubers, birds and rodents pose a serious threat to the furnace on your RV. They can enter through the furnace vents and cause serious damage by building nests that interfere with air flow. Kohree 2. 8 Inch Diameter Flying Insect RV Furnace Screen fits Duo-therm and Suburban furnace vents.