6" x 26" or 26" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 28.5"] 8in diameter function toggleAccordion(event) { event

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

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

+ Product Details Size – 14"w X 26"h is the size for the duct opening measurement only

The 1/2" white insulation

6" x 26" or 26" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 28.5"] 8in diameter function toggleAccordion(event) { event+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 26" or 26" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 25. 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