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Thread: 4 inch flue pipe

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    Default 4 inch flue pipe


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    As the title....i bought a scruffy stove for the shed of little power...i need a flue pipe , about 4 feet with elbows and plates to go through the roof/ wall.

    Anyone got any , preferably doing budgie impressions?

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    Default Re: 4 inch flue pipe

    Wood burner flue has to be 6" now, according to the regs, (Which almost certainly dont apply to sheds, but will limit the potential for scrounging) but I think gas boilers use 4". I'd be looking for a skip on a building site. (old habits die hard..)

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    Default Re: 4 inch flue pipe

    Quote Originally Posted by chillitt View Post
    Wood burner flue has to be 6" now, according to the regs, (Which almost certainly dont apply to sheds, but will limit the potential for scrounging) but I think gas boilers use 4". I'd be looking for a skip on a building site. (old habits die hard..)
    Ok...i will start skip diving!

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    Default Re: 4 inch flue pipe

    I think you can still buy non standard pipes though - certainly my local brico still stocks 5"stuff (which hasn't been the "norme" for ages).
    Or you could just get an adapter and use the larger stuff. A lot of the older stoves I find in the junk shops are 4" outlet.

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    Default Re: 4 inch flue pipe

    Not seen any 4 inch on fb yet.

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    Default Re: 4 inch flue pipe

    Well, that was easier than I thought....local blacksmith, 6 feet of pipe and a 125mm circle of 5mmm steel for thre lid, 25.


    What I would describe as a result!
    He had a cnc plasma cutter.....lovely machine!

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    Default Re: 4 inch flue pipe

    for future reference, I use spiral wound ducting, which is pretty cheap, and comes in every size imaginable. It's only single wall, so you need to do wall penetrations properly, but otherwise works fine.

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    Default Re: 4 inch flue pipe

    Quote Originally Posted by Big Pete View Post
    for future reference, I use spiral wound ducting, which is pretty cheap, and comes in every size imaginable. It's only single wall, so you need to do wall penetrations properly, but otherwise works fine.
    I suspect my bit of tube was cheaper! I have a roof plate coming...i just need to build a little " binnacle" to feed it thru now. Oh...and a cap.

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    Default Re: 4 inch flue pipe

    might be, 3m of 150mm was ~a tenner, elbows and tees are what run the bill up.

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    Default Re: 4 inch flue pipe

    Ok, I was wrong....flexi is cheaper. TBH I didn't think it was ok on its own, so didn't look. Ah well.

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    Default Re: 4 inch flue pipe

    Carefull -

    Flexi can be thin aluminium and I wouldn't advise that for a flue.

    Steel spiral wound like the HEVAC boys use is rigid and dirt cheap because they use miles of it. Be carefull of the elbows and tees as some of it comes with rubbers seal built which I don't think are that heat resistant.

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    Default Re: 4 inch flue pipe

    Well....I have proved that mythical thing about welding cast...no matter how thin it is, you can't.

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    Default Re: 4 inch flue pipe

    Quote Originally Posted by davidat19 View Post
    Well....I have proved that mythical thing about welding cast...no matter how thin it is, you can't.
    I stick welded some cast (back end of my godin stove). I doubt it would stand up to punishment but it seems to do well enough for hot cold cycles. I was more surprised than anyone, was a dead cert for the bin.

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    Default Re: 4 inch flue pipe

    Quote Originally Posted by DefTrap View Post
    I stick welded some cast (back end of my godin stove). I doubt it would stand up to punishment but it seems to do well enough for hot cold cycles. I was more surprised than anyone, was a dead cert for the bin.
    This is the body of the stove pn the horizontal joins. I have used fire cement as my welds hadnt penetrated.
    Might be to do with the welder ...its a "My firstMIG" from lidl.

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    Default Re: 4 inch flue pipe

    special rods for cast, mostly nickel, so they cost a fortune, and it's an absolute PITA. There are a lot of different types of "cast iron" as well, some are easier than others, but none are nice.

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