10" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" x 12.5"] Grille + Product Details Size -

+ Product Details Size - 16"w X 16"h is the size for the duct opening measurement only

R value rating of insulation - R3

+ Product Details Size - 10"w X 30"h is the size for the duct opening measurement only

Installation Location – Sidewall and ceiling

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