Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

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]


Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!