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Intumescent/non-combustible sleeving/ducting in timber-framed buildings.

Farmboy
PE magazine have run the article 'Wiring Timber-Frame Buildings' (a typical construction example shown in the attachment), which seems similar to those alluded to by ES1st (in their BP Guide 5, Fire Safety).


When installing wall fans in timber-framed buildings, one option is to use intumescent sleeving (such as shown in the attachment) for flexible ducting (but seems quite expensive at approx £60 for a standard 100mm ducting up to 500mm). Another option is use non-combustible/metal ducting (as suggested in BPG5). However, does anyone know of a supplier for such metal ducting (fire rated or proven for such use)? When I ask wholesalers and fan manufacturers, they all seem bemused (with some saying they don't think anyone bothers to use them), and as yet a google search reveals little help.


F
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    alanblaby:

    Unsurprisingly, a Ventilation supplies Company are the people to go to for such items.

    We occasionaly use intumescent collars in flats. They seal the hole when they get too hot.




    Unsurprisingly, maybe, but surprisingly, useless. I called three Co's today and they all said they don't do anything specifically fire rated, they can't say that their metal pipes/ducts will be of use in preventing fire entering the wall void, and why bother anyway, they've not been asked this before, so just use plastic flexible pipe as others do (furthermore, a manufacturer of intumescent collars said their collars are tested for ceiling use only, not walls, so best to check whether collars used are for use in walls).


    So, looks like it's a case of giving people the option of plastic pipe or the pricier intumescent sleeve, and forget about metal.


    F

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  • 0

    alanblaby:

    Unsurprisingly, a Ventilation supplies Company are the people to go to for such items.

    We occasionaly use intumescent collars in flats. They seal the hole when they get too hot.




    Unsurprisingly, maybe, but surprisingly, useless. I called three Co's today and they all said they don't do anything specifically fire rated, they can't say that their metal pipes/ducts will be of use in preventing fire entering the wall void, and why bother anyway, they've not been asked this before, so just use plastic flexible pipe as others do (furthermore, a manufacturer of intumescent collars said their collars are tested for ceiling use only, not walls, so best to check whether collars used are for use in walls).


    So, looks like it's a case of giving people the option of plastic pipe or the pricier intumescent sleeve, and forget about metal.


    F

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