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Looking for difference of venting capacity between a Gorton G6A and Hoffman #40a

tim smith
tim smith Member Posts: 2,752
Ratings helpful please. Called Gorton and their guy who has any info is out and nothing on website except for 8 times the capacity of standard vent. Whatever that means.
Thanks for any input


  • mattmia2
    mattmia2 Member Posts: 9,669
    There is some info at the end of this document:

    Not sure what the A suffix is.
  • tim smith
    tim smith Member Posts: 2,752
    thanks Matt
  • ethicalpaul
    ethicalpaul Member Posts: 5,704
    edited May 2022
    It's just a #6, same as a MoM #6, bigger than a #5, smaller than a "C". The "A" seems to just stand for "angle" (the vent is perpendicular to the direction of the mounting like most radiator vents).

    I personally believe trying to balance radiators with math is a mostly useless endeavor. Start with #4's downstairs, and #5's upstairs and let comfort be your guide after that
    NJ Steam Homeowner. See my sight glass boiler videos: https://bit.ly/3sZW1el
  • SteamingatMohawk
    SteamingatMohawk Member Posts: 1,007
    The math turns to magic when you have to consider the actual environment in each room, heated and unheated adjacent spaces (including above and below), facing north or south, prevailing winds, shade and probably a few more.

    @ethicalpaul has a decent starting point, but after that it's tweaking the mix. As he said, it's not measuring the exact temperature, it's comfort.

    Most inexpensive thermometers are not accurate. The handheld infrared thermometers are typically within 4F at room temperature.