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What is this pipe?

David Meiland

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We recently removed a pair of propane water heaters (one for radiant, one for DHW). They were side by side and wye'd together at the ceiling to a single pipe thru the roof. Combination of B vent and this shiny single-wall aluminum stuff. The long piece of shiny AL went down inside the B vent. Not real impressive.

What is the AL pipe actually made for?

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