10" x 22" or 22" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 24.5"] Width_20in + Product Details Size –

+ Product Details Size – 34" x 36" or 36" x 34" is the size for the duct opening measurement only

+ Product Details Size – 10" x 22" or 22" x 10" is the size for the duct opening measurement only

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 12" or 12" x 10" duct opening (measured at the opening)

10" x 22" or 22" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 24.5"] Width_20in + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 22" or 22" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 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