10" x 14" or 14" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 16.5"] 14in diameter + Product Details Size –

+ Product Details Size – 12"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 36 5/8" height

+ Product Details Size – 18" x 24" or 24" x 18" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 34 5/8" height -

10" x 14" or 14" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 16.5"] 14in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 14" or 14" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 13. 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