Gas Venting Standard Question

Discussion in 'Canadian Plumbing Code Questions' started by K-Rod, Oct 3, 2014.

  1. K-Rod

    K-Rod New Member

    Dec 12, 2011
    Saskatoon, SK

    Bit of a long story but I'll try to make it concise.

    My garage had an old 80,000 BTU unit heater, natural gas, hanging in the corner. It was very old and last spring finally gave up... started setting off my CO detector and found lots of cracks in the flues. It was vertical vented, and the old 5" double wall pipe looks fairly new and recent though. (only been in the house 3 years) I picked up a Mr. Heater 50,000 BTU unit to replace it, and it only has a 3" exhaust on the back.

    I have been trying to find a copy of CSA B149.1 that has the tables in Appendix C to give me the required vent sizes, but everything I can find online has the tables omitted, and it's like $200+ for a copy. A little steep when I just need to check one table.

    So my question is, does anyone have a copy of this and can either send me the table I need, or let me know what the required vertical vent size is for the new unit? Everything was already there from the old heater, so all I have to do is install and leak check the gas line from the wall to the heater (only about 18" of pipe). It would be nice to just leave the chimney as is, and just get the proper reducers to attach it to the unit. I have a feeling I need to replace it with 4" though....
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