10" x 12" or 12" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 14.5"] ceiling + Product Details Size -

+ Product Details Size - 24"w X 12"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 32" OR 32" X 16" duct opening (measured at the opening)

Actual Filter Size – 21 3/4"w x 25 3/4" x 1"

you have 16 different varieties to choose from

10" x 12" or 12" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 14.5"] ceiling + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 12" or 12" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 11. 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