20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter + Product Details Size -

+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only

+ Product Details Size – 24" x 26" or 26" x 24" is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 12" duct openings

ensuring it arrives at your home in perfect condition

20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 27. 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