36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w20h20 + Product Details Size –

+ Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 12 5/8" height

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Effortless Integration: Crafted for easy connection to supply grilles of drop ceiling T-Bar vent covers

controlled by a switch

36" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w20h20 + Product Details Size –+ 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