34" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Size -

+ Product Details Size - 22"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 30"h is the size for the duct opening measurement only

Design – Easy unrestricted airflow for your HVAC system - 50° angled to provide maximum airflow

actual front end outer dimensions are approximately 29

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 6" duct openings

34" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 36" OR 36" x 34" 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 33. 75" x 35. 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