26" x 6" or 6" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe and sound level range of

and sound level range of NC 25 to 35

+ Product Details Size - 14"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 30"w X 14"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening)

26" x 6" or 6" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Round Duct Pipe and sound level range of+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 6" OR 6" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 5. 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 Made