18" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Powder Coated align-items: center

align-items: center

and the second number represents the height

+Why Hvac Premium HVAC Premium has been providing superior quality service for many years

enhancing the entire room with its elegant presence

+ Product Details Size - 36"w X 12"h is the size for the duct opening measurement only

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