6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 20.5"] Copper Coil 10"w X 8"h Is The

10"w X 8"h Is The Size For The Duct Opening Measurement Only

actual front end outer dimensions are approximately 41

Roundover Beveled Edges

+ Product Details Size - 18"w X 30"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 35 3/4" x 1"

6" x 18" or 18" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 20.5"] Copper Coil 10"w X 8"h Is The+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 18" or 18" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 17. 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