30" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Diameter + Product Details Size -

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

Ideal for Walls & Ceilings: Designed for seamless installation in standard 20" X 4" duct openings

High Quality – High-quality aluminum with counter-sunk screw holes (screws included) and no sharp edges

With its compact size and high-quality materials

+ Product Details Size – 32"w X 6"h is the size for the duct opening measurement only

30" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6" Diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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