36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat font-size: 14px

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+ Product Details Size – 24"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 20" x 30" or 30" x 20" is the size for the duct opening measurement only

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

+ Product Details Size - 28"w X 36"h is the size for the duct opening measurement only

36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat font-size: 14px+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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 Made from