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Recognize This Air Vent?

BuildingOpsGregg
BuildingOpsGregg Member Posts: 3
in THE MAIN WALL
Anybody recognize this old air vent?
Rusted & difficult to read, but would def like to replace with same size/exact model if possible...

Thanks fellas,

Gregg

Comments

  • ChrisJ
    ChrisJ Member Posts: 16,972
    I'd bet @Steamhead knows what it is.
    Curious, why do you want to replace it with something the same size and exact model?


    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • bob_46
    bob_46 Member Posts: 813
    I think it says Hoffman Specialty 74 on the side .

    There was an error rendering this rich post.

  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,577
    You will need a bigger vent, maybe more than one. Try a big mouth from the store here.
    what size are the mains which this handles?--NBC
  • BuildingOpsGregg
    BuildingOpsGregg Member Posts: 3
    Answering ChrisJ, I'm going same size/model or similar so I don't screw it up, they probably sized it correctly.

    Thanks Bob you're right about the Hoffman Specialty.

    Nicholas, why do you think the system needs a bigger vent or multiple?

    Thanks fellas,
    GREGG
  • KC_Jones
    KC_Jones Member Posts: 5,887
    BuildingOpsGregg said:

    Answering ChrisJ, I'm going same size/model or similar so I don't screw it up, they probably sized it correctly.



    Thanks Bob you're right about the Hoffman Specialty.



    Nicholas, why do you think the system needs a bigger vent or multiple?



    Thanks fellas,

    GREGG

    Perhaps if it was originally coal fired it was correct, but I highly doubt it is enough venting with a modern boiler. You should measure the length and size of your mains and post it, we will be able to recommend how much venting you may need.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • BuildingOpsGregg
    BuildingOpsGregg Member Posts: 3
    Answering KC Jones:

    Roger that, heading over now, will grab a tape and post more details, thanks KC!

    -BuildingOpsGregg
  • Fred
    Fred Member Posts: 8,542
    That's a Hoffman #74 vent. Not right for a Main vent anyway. The #74 is designed as a steam heater vent. The #75 is the correct vent for a main but it is probably way to small for the average Main.
  • ChrisJ
    ChrisJ Member Posts: 16,972
    Fred said:

    That's a Hoffman #74 vent. Not right for a Main vent anyway. The #74 is designed as a steam heater vent. The #75 is the correct vent for a main but it is probably way to small for the average Main.

    What's a "Steam heater vent" ???

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    Dan Foley
  • Fred
    Fred Member Posts: 8,542
    ChrisJ said:

    Fred said:

    That's a Hoffman #74 vent. Not right for a Main vent anyway. The #74 is designed as a steam heater vent. The #75 is the correct vent for a main but it is probably way to small for the average Main.

    What's a "Steam heater vent" ???

    It has a drop away and operating pressure of 35 PSI.
    http://www.supplyhouse.com/Hoffman-401429-74-1-2-x-3-4-Straight-Steam-Unit-Heater-Air-Valve-11740000-p
  • JUGHNE
    JUGHNE Member Posts: 11,505
    Maybe think of a hanging fan forced steam coil/fins unit heater.
  • Steamhead
    Steamhead Member Posts: 18,071
    Correct. What pressure does your system run?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting

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