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gas heating chimney sizing using b-vent

Paul S_3
Paul S_3 Member Posts: 1,288
in Gas Heating
Hey everyone I have this job where I'm relocating a boiler room...I will be installing 4 natural draft 70k btu input hot water boilers with 4 40 gallon water heaters.....the old boiler room setup had a masonry chimney that is falling apart. ....this job is in NYC ....I'm using the nyc gas fuel code to size the chimney. ...I came up with 10 inch b vent. ...With all the appliances I get 440 k btu....the height of the chimney will be around 40 feet. ...no lateral connections. ...I used a connector rise of 3 feet.....I used the chart for 2 or more appliances, category 1,appliance vent connection=single wall metal connector. I used the chart on page 71 of the NYC gas fuel code. I myself have never done this before. ....just want to double check my sizing of 10 inch b vent with you guys thank you much appreciated Paul S
ASM Mechanical Company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
ASMMECHANICALCORP@GMAIL.COM
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
ScottSecor

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Comments

  • Paul S_3
    Paul S_3 Member Posts: 1,288
    ?
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    ASMMECHANICALCORP@GMAIL.COM
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
  • ChrisJ
    ChrisJ Member Posts: 16,762
    edited July 2015
    I'm not a pro but as long as you're using a chart provided by the manufacturer of the b-vent, and using the "multiple appliance" table you should be fine.

    If I was you I'd call the manufacturer and just double check with them. Whether or not NYC code has something different I have no idea.

    But, worse case, I figure by posting I'll at least get your thread back to the top of the list.

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

  • Tim McElwain
    Tim McElwain Member Posts: 4,655
    I do not have my code book handy let me get hold of it and check and get back to you.
  • Paul S_3
    Paul S_3 Member Posts: 1,288
    Thank you Tim
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    ASMMECHANICALCORP@GMAIL.COM
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
  • Tim McElwain
    Tim McElwain Member Posts: 4,655
    Your calculations are correct in accordance with NFPA 54 National Fuel Gas Code.

    I would suggest however that you refer to Selkirk Metalbestos handbook for correct set up and application. If you do not have a copy I can send you one just contact me at my e-mail address gastc@cox.net and give me your address and I will mail it to you.
    ChrisJZman
  • Tim McElwain
    Tim McElwain Member Posts: 4,655
    Handbook is in the mail.
    ChrisJZman
  • ChrisJ
    ChrisJ Member Posts: 16,762
    Tim McElwain said:

    Handbook is in the mail.

    You're one of the best Tim.

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

  • Tim McElwain
    Tim McElwain Member Posts: 4,655
    Thank you!

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