36" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat + Product Details Size –

+ Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

75" Width X 37

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 12" duct openings

+ Product Details Size – 32"w X 25"h is the size for the duct opening measurement only

36" x 32" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder-Coat + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 32" OR 32" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 31. 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