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main vent question

Jeff_66 Member Posts: 43

First, are Hoffman Vacuum Valves #16 antiquated? There are 2 on steam mains in my basement and I can't find any info on them (I'm thinking of replacing them).

Second, how do I determine the number of necessary main vents on a one-pipe system? I have a Gorton #2 at the very far end of the house. Some areas closer to the boiler don't have any main vent nearby.
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