Gas bottle wood burner flue

  1. zedhead Member

    Messages:
    58
    Location:
    Lincolnshire
    Having finally got around to making a wood burner from the gas bottle I got over two years ago, I've just about finished the construction of the burner itself (just ran out of MIG wire before fitting the doors and fittings), but I now need to think about the flue stack.
    It's going into a garage / workshop, and after a quick look at flue stacks on tinterwebs, I've come to the conclusion that they ain't cheap!
    What do most people use? And how do they connect the stack to the burner?
    I've seen the flues that are sold for household woodburners, such as those sold by Machine Mart, and right now I can't justify spending that kind of dosh...
     
  2. jimbo84 Member

    Messages:
    630
    Location:
    Up North
    What about some flue liner, or a trip to the scrappers for some steel pipe.
     
  3. bigegg

    bigegg I drink and I know things. Its what I do.

    Messages:
    6,500
    Location:
    Leeds, West Yorkshire
    depending upon the dimensions of your firebox, commercial (60mm?) exhaust pipe might work - got a commercial breakers nearby?
     
  4. gaz1

    gaz1 Forum Supporter

    Messages:
    8,654
    Location:
    westyorkshire
    flue liner isnt cheap either getting second hand is risky

    second hand double wall not so bad but needs to be sealed

    I can use flue liner as im not hitting a wood stoves high heat temps

    if you post a pic i can advise more but need more info about roof construction and also wall construction and if you can go out the wall side

    bigegg depends on his construction for size of flue that needs to be used normally 5" but you can go lower to a pellet stove 3"
     
    bigegg likes this.
  5. steviec_lj

    steviec_lj Rust Welding Professional

    Messages:
    2,380
    Location:
    Barnetby, N.Lincs
    60mm???

    OP, get yourself to an HGV breakers yard, and grab some exhaust, best part of 4-5” tube
     
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  6. Shedendman

    Shedendman Member

    Messages:
    3,591
    east sussex
    Make one,dont have to be round,square will do,say 4-5" box
     
    stuvy and Parm like this.
  7. sardine

    sardine Member

    Messages:
    2,908
    Location:
    Buckinghamshire
    If you put 60 mm flue on it you will die of carbon monoxide poisoning.
     
    stuvy, zedhead and bigegg like this.
  8. jordhandson Member

    Messages:
    507
    Location:
    Dorset
    You wana go bigger than 60mm it helps with the draw bigger is better you can always reduce the draw with a gate or a slide
     
    stuvy, Parm and bigegg like this.
  9. sardine

    sardine Member

    Messages:
    2,908
    Location:
    Buckinghamshire
    If you restrict the flue with a damper on a home made not very airtight stove you will die of carbon monoxide poisoning for a second time.
     
    tlovatt, stuvy, zedhead and 3 others like this.
  10. gaz1

    gaz1 Forum Supporter

    Messages:
    8,654
    Location:
    westyorkshire
    practice is not to use a damper unless your in an area with high winds and it over pulls on your wood stove then you need to use a damper to control the flow from your stove up the flue pipe

    the damper wasnt meant to be used as a controller for your stove

    other use for damper being used is to close off the draft from the chimney or going up the chimney
     
    stuvy likes this.
  11. julianf

    julianf Member

    Messages:
    4,109
    Location:
    devon, uk
    If it does not need to be compliant, is standard steel pipe no good for you?

    My feeling is that you would want 4" ish. 5" would be fine but more money. Less than 4 and I think you will be causing trouble for yourself.

    If you get mild steel tube, just weld it to the burner when you have it in situ.

    One of those high temp flashings (which will still melt if you go too hot) is about £20 off eBay.
     
    zedhead likes this.
  12. bigegg

    bigegg I drink and I know things. Its what I do.

    Messages:
    6,500
    Location:
    Leeds, West Yorkshire
    i just measured the piece of exhaust i got to use as a flue.

    110mm

    i have no idea where i got the "60mm" from. :ashamed:
     
    stuvy, steviec_lj and gaz1 like this.
  13. zedhead Member

    Messages:
    58
    Location:
    Lincolnshire
    Thanks for your replies - the roof is corrugated stuff a bit like asbestos, don't think it is though, and I have to go through the roof as the burner will be sited against a brick pillar between two garage doors. It's about two and a half metres to the roof, but will need to measure how far that'll be from the top of the burner.
    I've no idea where there's a decent scrap yard around here, not been living around here for long, but the option of square pipe could open up the search a little!
     
  14. zedhead Member

    Messages:
    58
    Location:
    Lincolnshire
    Hmm, just found a company on ebay that do 4" exhaust tube at a good price and deliver too!
     
    bigegg likes this.
  15. Shedendman

    Shedendman Member

    Messages:
    3,591
    east sussex
    Really,and how much a metre is it,does it come in long lengths,if not how you going to join them up?
    Out of interest of course
     
  16. gaz1

    gaz1 Forum Supporter

    Messages:
    8,654
    Location:
    westyorkshire
    slim_boy_fat and zedhead like this.
  17. zedhead Member

    Messages:
    58
    Location:
    Lincolnshire
    They can supply up to 2m in length, which should get from the top of the burner to the roof easy enough (I'll know when I measure it properly), at thirty quid delivered, new material.
     
    Shedendman likes this.
  18. zedhead Member

    Messages:
    58
    Location:
    Lincolnshire
    Brill, thanks, would be a lot easier to go through the roof directly above the burner and extend the stack so it's tall rather than route it under the roof line and through the apex. ;-)
     
  19. Shedendman

    Shedendman Member

    Messages:
    3,591
    east sussex
    Cool,link please;)
     
  20. knighty Forum Supporter

    Messages:
    1,769
    Location:
    Sunderland
    all the home made garage ones I've seen use a bit of 100mm galvanised steel duct

    just need to be careful where it goes through the roof incase it gets hot

    this stuff....
    NAT_SPD_100_1000.jpg
     
    delta9 likes this.
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