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steam radiator vent

  1. Steam vents : even new ones don't work

    HVAC
    Old (1930 ish) single-pipe steam system .. one of the radiators has a steam vent that refuses to close .. even after replacing it with new Hoffman units (I tried two new ones) .. I know the replacements work because I tried them elsewhere. I'm sure the vent isn't binding because I can hear it...
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