14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Size -

+ Product Details Size - 14"w X 4"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 10" duct openings

Actual Filter Size – 27 3/4"w x 21 3/4" x 1"

+ Product Description Maximize HVAC efficiency with our aluminum eggcrate return air filter grille

14" x 26" or 26" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter return filter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 26" OR 26" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 25. 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