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Main vent ID

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kcopp
kcopp Member Posts: 4,432
edited October 2019 in Strictly Steam
Any one out there ID this main vent? Please. Went look at a very large system and they had replaced these w little Ventrite # 35’s .. I need to replace w something more appropriate. Picture was from the Land lord. Lok similar to Hoffman 75/77... Ty, kcopp

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  • Fred
    Fred Member Posts: 8,542
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    That vent looks to be mounted on its side. If so, it wouldn't work under any circumstance. They need to be mounted vertically.
    In any case, it is not a Hoffman 75/77. There are much better venting options available for larger mains, like the Barnes and Jones BigMouth, available at Supplyhouse . com, link below.
    https://www.supplyhouse.com/sh/control/search/~SEARCH_STRING=Bigmouth vent?searchText=Bigmouth+vent

    Is this a one pipe or two pipe system? That may impact where the vents should be installed.
  • JUGHNE
    JUGHNE Member Posts: 11,062
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    Fred, look at the pipe hangers and rotate the picture. :)
    Danny Scullykcopp
  • Fred
    Fred Member Posts: 8,542
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    JUGHNE said:

    Fred, look at the pipe hangers and rotate the picture. :)

    @JUGHNE , I was looking at the door trim in the background. Now that you raised the issue, my assumption that that door drops to the floor is obviously wrong. That is sideways Too, :)
    ethicalpaulkcoppJUGHNE
  • kcopp
    kcopp Member Posts: 4,432
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    Single pipe system. The other contractor pulled out and tossed the old vents.
    A big mouth is prob best then. Just wanted a comparison as the original folks knew better.
  • Fred
    Fred Member Posts: 8,542
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    kcopp said:

    Single pipe system. The other contractor pulled out and tossed the old vents.
    A big mouth is prob best then. Just wanted a comparison as the original folks knew better.

    Vent size wasn't as critical back when the system was originally installed. They were coal fired and typically ran, at various firing rates, from the first cold day until the next spring. Once the air was out of the system, at the first firing, there was little to no air to remove after that, except where a boiler might have been allowed to run out of fuel.
    Not the case today, with all the cycling. Air needs to be expelled multiple times a day. The faster/higher capacity main vents are the most effective.

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