16" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum steel + Product Details Size -

+ Product Details Size - 24"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 20" x 20" is the size for the duct opening measurement only

Please check the measuring guide to ensure a proper fit

Designed for optimal air flow and lasting durability

16" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum steel + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 15. 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 from