10" x 24" or 24" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 26.5"] w25h25 + Product Details Size -

+ Product Details Size - 14"w X 12"h is the size for the duct opening measurement only

+ How To Measure A Grille Measure the size of the vent opening

fasten the edges to studs with the provided screws

actual front end outer dimensions are approximately 18 5/8" width X 26 5/8" height

actual front end outer dimensions are approximately 16 5/8" width X 16 5/8" height

10" x 24" or 24" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 26.5"] w25h25 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 24" or 24" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 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