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The Metal-Fab 3MIX5 is a double wall vent pipe increaser with a larger end size of five inches and a smaller end size of three inches. This gas vent increaser is made from aluminum alloy for the flue and G90 galvanized steel for the casing. It meets UL 441 and NFPA 54/211 standards, ensuring safety and reliability in a range of applications.
This increaser is designed for use in gas boiler systems, furnaces, and fireplaces. It features an innovative twist-lock connection that simplifies installation, eliminating the need for sheet metal screws. Its double-wall construction provides durability while maintaining efficient venting performance.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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