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gas heating chimney sizing using b-vent

Paul S_3Paul S_3 Posts: 1,257Member
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. 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.
[email protected]


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