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"] w8h8 + Product Details Outer dimensions:

+ Product Details Outer dimensions: 21

+ Product Details Size – 10" X 4" is the size for the duct opening (floor/vent hole) measurement only

Measure the size of the air duct/drywall opening

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Ideal for Walls & Ceilings: Designed for seamless installation in standard 10" X 6" duct openings

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"] w8h8 + Product Details Outer dimensions:+ 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