14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter flat stamped steel + Product Details Size –

+ Product Details Size – 32"w X 25"h is the size for the duct opening measurement only

+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only

Great emphasis has been invested in the design of this product to prevent it from kinking in sharp bends & turns and to hold steady and at full diameter in all applications

+ Product Details Size – 18" x 28" or 28" x 18" is the size for the duct opening measurement only

14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter flat stamped steel + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 36" OR 36" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 35. 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