30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter 75"H – fits a 10"

75"H – fits a 10" X 6" duct opening

75" width X 15

+ Product Details Perfect Fit & Easy Sizing - Designed for a 28" x 34" OR 34" x 28" duct opening (measured at the opening)

+ Product Details Size – 18" x 20" or 20" x 18" is the size for the duct opening measurement only

30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter 75"H – fits a 10"+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 24" OR 24" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 23. 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