22" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" + Product Details Perfect Fit

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

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

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

Actual Filter Size – 25 3/4"w x 31 3/4" x 1"

+ Product Details Size – 18"w X 25"h is the size for the duct opening measurement only

22" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 6" OR 6" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 5. 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