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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.


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    Presumably the same thinking should apply for timber fire resisting elements in non-timber framed buildings too - i.e. the suspended floor/ceiling below a 2nd floor or between flats.


    I'm not sure that simple metal ducting would of itself be a help - it would soon reach the temperature of the fire and so risk setting light to anything flammable touching or near to it. You'd almost have to treat it like a metal flue from a combustion appliance have have sizeable spacings all around to anything flammable.


      - Andy.
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    Presumably the same thinking should apply for timber fire resisting elements in non-timber framed buildings too - i.e. the suspended floor/ceiling below a 2nd floor or between flats.


    I'm not sure that simple metal ducting would of itself be a help - it would soon reach the temperature of the fire and so risk setting light to anything flammable touching or near to it. You'd almost have to treat it like a metal flue from a combustion appliance have have sizeable spacings all around to anything flammable.


      - Andy.
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