Specification: RVGUARD insect screen 4.5 x 4.5 x 1.3 Inch is for Water Heater: Atwood furnace vent models 2540, 8516, 8520, 8525, 8531, 8535, and 8940; Fits for Suburban 6, 10, and 12-gallon water heater vents and fits most battery vents. 8.5 x 6 x 1.3 : Fits for Atwood 6 & 10 Gallon and Suburban 6 Gallon water heater vents. Last to Use: RVGUARD pest screens are made with high-grade stainless steel to ensure they stay intact and corrosion-free over your vents so your investment stays protected. And it is easy to clean to look good. Easy to Install: Simple installation with all needed tools included: 4 stainless steel spring hooks, 1 installation tool, and silicone strip. The silicone strip edging provides noise and scratch-free application even during cold weather. Instruction is also included. It takes no more than 2 minutes to install. Keep Pests Out: Using an insect screen is an economical way to protect the furnace and your home from flying insect nests. Protect children and pets from vent exposure. Get Maximum Airflow: RVGUARD insect screen see-through, breathable wire mesh covers for RV with large enough gaps for optimal airflow but small enough to keep away bugs. ASIN B08GS24FDJ Brand RVGUARD Item Weight 10.5 ounces Manufacturer RVGUARD Item model number ARGVSK-F Package Dimensions 10.98 x 7.64 x 1.54 inches Manufacturer Part Number ARGVSK-F