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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorcrt
    • CommentTimeAug 4th 2017
    Hi, it's been a while since I've been here. We want to put a log burning stove in an annex to our house but flue length is a problem. We've got two other stoves, an esse log oven and a 40kx boiler, but this latest one is vexing me. Issue is, the stove needs to go in the first floor of a building which has built up into the roof space so the best we can get is around 2.5m flue length without having a massive length above the ridge (support, asthetics and listed building issues). Recommendation is obviously 4.5m so we have a 2m deficit.

    Guidance seems to be that you can go with shorter length if stove manufacturer says it's ok.

    This must be doable as plenty of stoves seem to go into single storey workshops, conservatories, and shepherd huts etc, but I am finding it difficult to get any info about stoves that will work properly with short flues.

    (I've looked at Vesta, but their technical info is silent on the point, even though they are marketed as short flue compatible, and the person I spoke to there was vague about it).

    Any ideas?


    Posted By: crtand the person I spoke to there was vague about it

    Don't talk to the person - send the Company an email or letter. That way you get a considered reply that they have some liability for. Unless you do that you are on your own- no one (in their right mind) is going to recommend that you ignore the advice of the manufactures or install contrary to those recommendations.

    Chimneys can be fickle things much affected by their surroundings so be ready for the 'install as per our recommendations' reply
    • CommentAuthorowlman
    • CommentTimeAug 4th 2017
    What is your definition of "massive length above the ridge"? You are going to need some clearance in order to meet regs. anyway.
    • CommentAuthorcrt
    • CommentTimeAug 4th 2017
    Approx 2 m above ridge, vs the 600mm minimum under the regs. All we have is c1.8 above the stove, straight through the ceiling into the roof space (c300m) out right by the ridge and then c800mm beyond, giving me a problem.
    • CommentAuthorowlman
    • CommentTimeAug 4th 2017
    Have you discounted flue fans? I know they are expensive, but there are inline ones available so it won't look ugly outside. I don't know if they can be counted against actual flue length but I don't see why not.
    • CommentAuthorowlman
    • CommentTimeAug 4th 2017
    • CommentAuthorHollyBush
    • CommentTimeAug 4th 2017
    google boat or Barge stoves...
    • CommentAuthorcrt
    • CommentTimeAug 5th 2017
    I like the idea of flue fans but one of the usages we will put the area to is a holiday let and it's risky enough letting them have a stove let alone vagaries of having to switch a fan on (assuming that is how they work).
    • CommentAuthorowlman
    • CommentTimeAug 5th 2017
    Presumably you could rig a electro switch on the stove door, plus a very, very slow fan. Otherwise it would provide too much forced air resulting in too fast a burn.
    With further confirmation that wood burners cause damage to neighbours health ( see Sunday times 16th July 2017and the comprehensive Mikee5 contribution on GBF) it surely becomes priority to minimise health impact and not maximise the damage potential by facilitating release of the deadly emissions close to the ground . With confirmation that 31% of toxic fine particles are already created by wood burners and with 200,000 additional units installed each year guaranteeing air quality damage equating to millions of extra diesel vehicles operating in the UK it would appear time for the application of joined up thinking, due diligence and duty of care .
    It is reported that the Stove Industry Alliance promise new designs will slash emissions within five years but what happens to the 1.25 million wood burners already damaging health? NOX production is a further concern especially when aware nitrogen content in the fuel can vary by a factor of 20 plus, a Scottish Nov 2008 report confirmed wood burning creates levels of toxic pollution many times higher than equivalent gas or oil. Fire Authorities report a substantial increase in domestic chimney fires due to wood burning which further confirms pollution content in the emissions. The contribution to reported 40,000 UK deaths due to air pollution annually surely warrants investigation and action. Rgds Brian Wilson
    • CommentAuthorgyrogear
    • CommentTimeAug 7th 2017
    I suspect it would be easier and more efficient just to suppress air travel.

    Posted By: crtI like the idea of flue fans but one of the usages we will put the area to is a holiday let and it's risky enough letting them have a stove let alone vagaries of having to switch a fan on (assuming that is how they work).

    In my experience anything that holiday guests (or campers) have to operate has to be absolutely idiot proof and then some.
    • CommentAuthorSimonMF
    • CommentTimeAug 7th 2017
    With regards to what Brian Wilson is saying, it is possible to establish an acceptable criteria for wood stoves. I know a Euro 6 car typically chucks out 100gram PM2.5 but their exhausts are at ground level. Surely, it would be okay for wood stoves to emit 300g given chimneys are high up. A really clean stove emits 3gram for every kg burnt, so perhaps there should be no criticism if only a 100kg were to be burnt each year. This sounds like ten days of burning to me.

    I realise this is a digression to the main point of the thread and I apologise for that.
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