22" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe + Product Details Size -

+ Product Details Size - 16"w X 6"h is the size for the duct opening measurement only

Air Flow – Ensure a quiet and smooth HVAC system with noise-free components

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

+ Product Details Size - 22"w X 28"h is the size for the duct opening measurement only

22" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 30" OR 30" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 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