36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return This versatile guard features air

This versatile guard features air circulating ports on all four sides to allow proper airflow

+ Product Details Size – 22"w X 16"h is the size for the duct opening measurement only

Say goodbye to pest-related worries as the built-in back 1/2" mesh acts as a barrier against unwanted rodents like mice

please note that the total outer dimensions of the grille measure 6" in diameter

36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Return This versatile guard features air+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 6" OR 6" x 36" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 5. 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