24" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 + Product Details Size -

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

+ Product Details Size – 22"w X 29"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 6" duct openings

+ Product Details Size – 28"w X 8"h is the size for the duct opening measurement only

24" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w36h36 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 22" OR 22" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 21. 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