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Thread: New Main Vents

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  1. #1
    Join Date
    Oct 2005
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    I noticed on my new boiler that the installer used Vent-Rite #75 main vents. I can find information for Dole and Hoffman, but not Vent-Rite. I think they have been bought out. I wonder if anyone has the pressure spec for this vent? I know for this boiler there should be low pressure (about 3psi) mains. Also when installing main vents should they be located up above the mains on a length of pipe instead of right into the main? I know they close on pressure, but how about temperature?

  2. #2
    Join Date
    Jan 2003
    Kansas City
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    They close on temperature and they are generally installed above the return, but not on an end of main tee. If this is a residential system, you shouldn't need to exceed 1/2 psig to heat it.

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