30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter + How To Measure A

+ How To Measure A Grille Measure the size of the vent 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"w X 12"h X 2"d (for duct opening measurement only)

75"H – fits a 10" X 6" duct opening

30" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Diameter + How To Measure A+ 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