12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Size –

+ Product Details Size – 20"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 36"w X 32"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 20"h is the size for the duct opening measurement only

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

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 22" or 22" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 21. 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