6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 10.5"] Return Grille ISO Supply Diffusers perform efficiently

ISO Supply Diffusers perform efficiently with air loadings of 6 to 30 air changes per hour (based on 10 ft

Ideal for Walls & Ceilings: Designed for seamless installation in standard 12" X 8" duct openings

minimizing waste

Experience enhanced indoor comfort with our 6" Butterfly Damper

Looks like new after years of use

6" x 8" or 8" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 10.5"] Return Grille ISO Supply Diffusers perform efficiently+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 8" or 8" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 7. 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