6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 38.5"] return grille actual front end outer dimensions

actual front end outer dimensions are approximately 5

Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [17

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+ Product Details Size – 12"w X 18"h is the size for the duct opening measurement only

6" x 36" or 36" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 38.5"] return grille actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 36" or 36" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 35. 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