24" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size -

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

+ Product Details Size - 34"w X 26"h is the size for the duct opening measurement only

+ How To Measure A Grille

Available in both standard and custom sizes

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

24" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 23. 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 from