8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 36.5"] Brown Removable core for access to

Removable core for access to optional damper

4" X 10" Is The Size For The Duct Opening (floor/vent hole) Measurement Only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 28" or 28" x 8" duct opening (measured at the opening)

+ Product Details Size - 6" X 6" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening)

8" x 34" or 34" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 36.5"] Brown Removable core for access to+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 34" or 34" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 33. 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