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Main air vent

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• Mute

georgearoush Member Posts: 27

December 2025 in Strictly Steam

A simple question, but the answer I think might back “it depends.”

How do I know when it is time to change the main air vent? Are there any signs or clues I should look for that indicate it needs replacement?

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Comments

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  109A_5 Member Posts: 3,548

  December 2025

  Mostly if it does not close with the presence of steam. Also I suppose it if becomes restricted due to corrosion, etc.

  National - U.S. Gas Boiler 45+ Years Old
  Steam 300 SQ. FT. - EDR 347
  One Pipe System

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  ethicalpaul Member Posts: 8,198

  December 2025

  yep it has to vent air and not steam. But I’ve seen them failed closed that you really couldn’t tell from in the living area of the house

  NJ Steam Homeowner.
  Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
  See my sight glass boiler videos: https://bit.ly/3sZW1el

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