20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 12" OR 12" x 26" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 24" or 24" x 10" duct opening (measured at the opening)

+ Product Details Size – 24"w X 10"h is the size for the duct opening measurement only

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+ Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only

20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 11. 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