36" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille if your hole is 20"

if your hole is 20" wide by 14" tall

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

Carefully shrink wrapped with cardboard backing to prevent damage in shipment

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

Installation Location – Wall or door mount - door thickness up to 32mm - anodised finish - smooth & beautiful

36" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Supply Grille if your hole is 20"+ 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