22" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d + Product Details Size -

+ Product Details Size - 28"w X 18"h is the size for the duct opening measurement only

Weather and Pest Proof – These louvers are especially designed to prevent water from entering your home

actual front end outer dimensions are approximately 12 5/8" width X 10 5/8" height

8" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

actual front end outer dimensions are approximately 12 5/8" width X 32 5/8" height -

22" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter d + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 20" OR 20" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 19. 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