20" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Filter Grille with actual outer dimensions of

with actual outer dimensions of 12

+ Product Details Size - 8"w X 24"h is the size for the duct opening measurement only

+ Product Details Size - 26"w X 24"h is the size for the duct opening measurement only

+ Product Details Size – 8" x 12" or 12" x 8" is the size for the duct opening measurement only

+ Product Details Size – 30"w X 16"h is the size for the duct opening measurement only

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