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- Brand: Metal-FabMaterial Thickness: 0.012 Inch (Inner Wall), 0.018 Inch (Outer Wall)Type: Double Wall, RoundSize: 4 Inch DiameterMaterial: Aluminum Alloy (Flue), G90 Galvanized Steel (Casing)Applicable Standard: UL 441, NFPA 54/211
 - Metal-Fab Type B Gas Vent Combines Hemmed Flues and Casings that Maximize Product Durability and Reliability and Minimize Installation Time
 - Surelock Locking System
 - Quick and Easy - B-Flex™ Eliminates Measuring, Special Adapters and Assembly of Rigid Pipe Length
 - Cost Savings - Saves Time and Labor, a Universal Solution to Connecting Appliances to Rigid B-Vent
 - Convenience - Ready to Install Right Out of the Box with Factory- Assembled Male and Female Positive Twist-Lock Ends
 - Made in USA
 
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