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    strok's Avatar
    strok Posts: 3, Reputation: 1
    New Member
     
    #1

    Apr 13, 2008, 11:25 AM
    Updating an exhaust pipe on my furnace
    I'm updating an exhaust pipe on my furnace.
    Currently I have 4" steel exhaust pipe coming from my DUKANE MPGA075B3 (75.000 BTUs) (AFUE% = 80%)
    I would like to update it to "Thermoplastic Pipe" because it require a 0 clearance to combustion material.
    Few questions: Do I have to use a 4" pipe or I can use a 3" pipe?
    Can this pipe handle the amount of heat my furnace producing?
    Thank you.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Apr 13, 2008, 02:04 PM
    I do not believe there is any approved plastic pipe for a 80% unit. There used to be but they had to pull it off the market. B vent can be used but it needs at least 1 inch clearance to comb. If the unit calls for 4 inch pipe you should not reduce it or other damage could happen.
    strok's Avatar
    strok Posts: 3, Reputation: 1
    New Member
     
    #3

    Apr 13, 2008, 02:19 PM
    Quote Originally Posted by hvac1000
    I do not believe there is any approved plastic pipe for a 80% unit. There used to be but they had to pull it off the market. B vent can be used but it needs at least 1 inch clearance to comb. If the unit calls for 4 inch pipe you should not reduce it or other damage could happen.
    Thank you hvac1000, do you have any reference (internet link) to "B vent" stuff? thank you
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #4

    Apr 13, 2008, 03:16 PM
    http://www.ventingpipe.com/category.cfm?categoryID=147&source=ggpipe&s_kwcid= b-vent|900914290


    here you go.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #5

    Apr 13, 2008, 03:18 PM
    http://www.ventingpipe.com/category.cfm?categoryID=147&source=ggpipe&s_kwcid= b-vent|900914290
    strok's Avatar
    strok Posts: 3, Reputation: 1
    New Member
     
    #6

    Apr 13, 2008, 04:23 PM
    Thank you

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