20" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 16" or 16" x 8" duct opening (measured at the opening)

+ Product Details Size - 4"w X 24"h is the size for the duct opening measurement only

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

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

Outer Dimensions Are 17

20" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 22" OR 22" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 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