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

+ Product Details Size – 20"w X 30"h is the size for the duct opening measurement only

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+ Product Details Size – 6"w X 14"h is the size for the duct opening measurement only

Actual Filter Size – 23 3/4"w x 25 3/4" x 1"

+ Product Details Size – 6" x 16" or 16" x 6" is the size for the duct opening measurement only

24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Material_Aluminum + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 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