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I have a one pipe steam system, with 8 radiators on two floors--not very big. Built in 1950.
Question: I don't see any vents in the basement on the mains. Is that possible that there is only the radiator vents?
Question 2: The mains exit the boiler in three directions. Two of the mains then reconnect on the other end of the basement, forming a big loop. Why?