36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way 75"H – fits a 16"

75"H – fits a 16" X 4" duct opening

with actual outer dimensions of 16

Ideal for Walls & Ceilings: Designed for seamless installation in standard 24" X 10" duct openings

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

+ Product Details Size – 32"w X 24"h is the size for the duct opening measurement only

36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way 75"H – fits a 16"+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 30" OR 30" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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