20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grilles + Product Details Size –

+ Product Details Size – 10" x 26" or 26" x 10" is the size for the duct opening measurement only

High Quality – High quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

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+ Product Details Size – 25"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 36"w X 10"h is the size for the duct opening measurement only

20" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grilles + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 35. 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