18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak 875" width X 8" height

875" width X 8" height

75"H – fits a 24" X 8" duct opening

+ Product Details Size - 10"w X 22"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 20 5/8" height

+ Product Details Outer dimensions: 7

18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak 875" width X 8" height+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 35. 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