Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
If our community has helped you, please consider making a contribution to support this website. Thanks!

chimney liner sizing

Options
gto400_1970
gto400_1970 Member Posts: 1
in Gas Heating
have a potential job with 96,000 btu gas boiler forty gallon hwh gas also 40,000 btus what size liner chimney about 30 ft in height a buddy says 5'' liner is fine to use is this correct have tried to get info from nat grid with no results any help greatly appreciated

Comments

  • Tim McElwain
    Tim McElwain Member Posts: 4,657
    Assuming both of these

    appliances are natural draft (no fan assisted) a total of 136,000 BTU's on a Type "B" common vent connector 30 feet high will handle up to 185,000 BTU's on a 5" Type "B" vent. Liners however are 20% less capacity than a "B" vent so a 5" liner would handle 185,000 x 20% = 37,000 subtracted from 185,000 it will handle 148,000 so your buddy is correct.



    I would however double check the charts for the type liner you put in to be accurate.
This discussion has been closed.

Categories