36" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille Its elegant look and fine

Its elegant look and fine finish and the natural warmth of oak wood will change the appearance of the entire room

Versatility and Durability: The red oak wood not only adds a touch of warmth and softness to your room but can also be sanded and refinished according to your specific application needs

+ Product Details Size – 10" x 14" or 14" x 10" is the size for the duct opening measurement only

+ Product Details Size – 36"w X 16"h is the size for the duct opening measurement only

if your hole is 20" wide by 14" tall

36" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille Its elegant look and fine+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 18" OR 18" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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