24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 + Product Details Size -

+ Product Details Size - 16"w X 20"h is the size for the duct opening measurement only

Powder-Coat Finish – smooth

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+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 8" duct openings

24" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 18" OR 18" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 17. 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