20" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 R Value Rating of Insulation

R Value Rating of Insulation - R3

+ Product Details Size – 12"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 14"w X 18"h is the size for the duct opening measurement only

The design eliminates noise and prevents louvers from vibrating

20" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 R Value Rating of Insulation+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 19. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum Made from