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

+ Product Details Size - 18"w X 24"h is the size for the duct opening measurement only

Its elegant look and fine finish and the natural warmth of oak wood

The total outer size of this grille is the listed size plus 2 and 5/8"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 34" OR 34" X 14" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 28" or 28" x 6" duct opening (measured at the opening)

30" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 22" OR 22" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 21. 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