30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Diameter + Product Details Size -

+ Product Details Size - 24"w X 36"h is the size for the duct opening measurement only

Heavy Gauge Steel

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

expanding or retracting the gap to meet your precise needs

30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 8" OR 8" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 7. 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