36" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil-Insulated Line Set actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 38 5/8" height -

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Each grille is carefully packaged with cardboard backing to prevent damage during shipment

40"w X 16"h Is The Size For The Duct Opening Measurement Only

+ Product Details Size – 18" x 24" or 24" x 18" is the size for the duct opening measurement only

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