36" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood Actual Filter Size – 27

Actual Filter Size – 27 3/4"w x 35 3/4" x 1"

With plain ends

75"H – fits a 24" X 4" duct opening

+ Product Details Size – 10"w X 16"h is the size for the duct opening measurement only

36" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood Actual Filter Size – 27+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 8" OR 8" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 7. 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