20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 + Product Details Size -

+ Product Details Size - 26"w X 16"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 10" or 10" x 8" duct opening (measured at the opening)

+ Product Details Size – 10"w X 8"h is the size for the duct opening measurement only

+ Product Details Size – 10" x 18" or 18" x 10" is the size for the duct opening measurement only

16" x 3" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply

20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 12" OR 12" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 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