36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way with actual outer dimensions of

with actual outer dimensions of 16

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

actual front end outer dimensions are approximately 10 5/8" width X 20 5/8" height

75"H – fits a 16" X 4" duct opening

Multi-shutter damper with easy lever for precise airflow control

36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way with actual outer dimensions of+ 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