6" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" x 8.5"] w16h16 + Product Details Size -

+ Product Details Size - 8"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 22"h is the size for the duct opening measurement only

These grilles and registers give you an extra measure of quality that are visible to your family members and house guests

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 16" or 16" x 12" duct opening (measured at the opening)

6" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" x 8.5"] w16h16 + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 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 from strong,