Check the listing for details. RV Insect Pest Vent Screen for Furnace and Water Heater Stainless Steel Trailer. Condition: New. Listed at 18.99 USD. Leisure Coachworks RV Insect Screen for Furnace and Water Heater Stainless Steel Mesh Free Shipping Ships Same Or Next Business Day ---Leisure Coachworks flying insect screen gurad for your furnace and water heater. ---Circular Furnace Screen Size: 2.83''x1.26'' ---Rectangle Water Heater Screen Size: 6''x8.5''x1.3'' ---Made from high quality and heavy-duty stainless steel, for maximum strength and longevity that resists corrosion. ---It is intended for Atwood furnace vents models 2540, 8516, 8520, 8525, 8531, 8535 and 8940, also fits for Suburban 6, 10 and 12-gallon water heater vents. ---Easy To Install: It is easy to operate and ready to install at any time, takes no more than a minute or two to install.(please see instructions in images.