16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black Weather and Pest Proof –

Weather and Pest Proof – These louvers are especially designed to prevent water from entering your home

+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only

and lay it flat in the grid

+ Product Details Size – 29"w X 22"h is the size for the duct opening measurement only

Every grille has a front end frame that will overlap at the wall joint

16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black Weather and Pest Proof –+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 30" OR 30" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 29. 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