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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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    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.




    Collars seem appropriate for horizontal application, such as for ceiling fans where gravity is pulling the intumescent material down onto the e.g. plasterboard, so can fill the hole when activated. However, i wonder about use in vertical applications such as in walls, where when the fan spigot and plastic vent pipe melts, there's nothing holding the intumescent  collar in place, so it could drop down in the wall void away from the fire before sealing the hole.


    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.




    Collars seem appropriate for horizontal application, such as for ceiling fans where gravity is pulling the intumescent material down onto the e.g. plasterboard, so can fill the hole when activated. However, i wonder about use in vertical applications such as in walls, where when the fan spigot and plastic vent pipe melts, there's nothing holding the intumescent  collar in place, so it could drop down in the wall void away from the fire before sealing the hole.


    F

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