8" x 32" or 32" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 34.5"] Color_Red Oak + Product Details Size –

+ Product Details Size – 16"w X 25"h is the size for the duct opening measurement only

Just run your finger along the edge of the top plate and you will find a smooth finished surface

+ Product Details Size – 6"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 18" x 36" or 36" x 18" is the size for the duct opening measurement only

8" x 32" or 32" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 34.5"] Color_Red Oak + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 32" or 32" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 34. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 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