6" x 10" or 6" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 12.5"] Compatible With Duct 10in + Product Details Size –

+ Product Details Size – 12"w X 12"h

+ Product Details Size – 12"w X 20"h is the size for the duct opening measurement only

installation is a breeze

+ Product Details Size - 30"w X 26"h is the size for the duct opening measurement only

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

6" x 10" or 6" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 12.5"] Compatible With Duct 10in + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 10" or 10" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 9. 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