Flying Insect Screen for Furnace Vent, Atwood/Hydroflame with no access door

Wasps, mud daubers, birds, and rodents pose a serious threat to your RV water heater, furnace, and stove. They can enter through vents and openings and cause serious damage by building nests that interfere with air flow. Protect your valuable RV investment with this easy-to-install screen to ensure that your vents stay free from costly invasion by unwanted pests. 3-3/4" diameter.