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

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

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 32" OR 32" x 28" duct opening (measured at the opening)

so you are not left with much waste

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 30" OR 30" x 22" duct opening (measured at the opening)

14" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 6" or 6" x 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 5. 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 Made