36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated + Product Details Size -

+ Product Details Size - 6"w X 28"h is the size for the duct opening measurement only

875" width X 8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 14" or 14" x 6" duct opening (measured at the opening)

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36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coated + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 6" OR 6" x 36" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 5. 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