6" x 12" or 6" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 14.5"] 10" Diameter + Product Details Size –

+ Product Details Size – 24"w X 8"h is the size for the duct opening measurement only

polished brass

+ Product Details Size – 20"w X 40"h is the size for the duct opening measurement only

With precise measurements and easy installation

+ Product Details Size – 22" x 26" or 26" x 22" is the size for the duct opening measurement only

6" x 12" or 6" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 14.5"] 10" Diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 12" or 12" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 11. 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