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Hoffman 76A main vent

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Reading The Lost Art of Steam Heating inspired me to get to know my heating system. The main vents are Hoffman 76A. I can't find anything about 76A. A plain 76 is for a vacuum system, which I don't have. Does anyone know anything about the 76A vent? I'm wondering whether my system is one of those that was "converted" from coal, and that the 76A is a NLA vent for coal systems. My system is a two pipe gas-feed steam.

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