20" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 12" duct openings

+ Product Details Size - 14"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are 8" diameter

width: 22px

20" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 14" OR 14" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 13. 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