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actual front end outer dimensions are 37
+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only
actual front end outer dimensions are approximately 41
Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 12" duct openings
Filter Size - 20
8" x 20" or 20" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 10.5" X 22.5"] Color_Black actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 8" x 20" or 20" x 8" duct opening (measured at the opening), with actual outer dimensions of 10. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 7. 75" x 19. 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
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