20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 28 5/8" height

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 4" duct openings

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

6"w X 6"h Is The Size For The Duct Opening Measurement Only

20" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w22h22 actual front end outer dimensions+ 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