12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_White + Product Details Size -

+ Product Details Size - 12"w X 20"h is the size for the duct opening measurement only

Actual Filter Size – 35 3/4"w x 7 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 36" OR 36" x 20" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 26" duct opening (measured at the opening)

12" x 22" or 22" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_White + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 22" or 22" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 21. 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