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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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    The initial post started talking about wall fans in timber framed houses. Normally these are situated on an outside wall so the ducting is very short and does not run through other people's property, especially in timber framed homes I imagine. In larger homes thing may be more complicated if air ducting runs through other people's homes or communal areas. The weak point is of course any plastic fan. In large buildings automatic fire stopper louvres can be installed in metal ducting, operated by electric motors, weights or springs.


    Fire dampers. https://en.wikipedia.org/wiki/Fire_damper


    Testing the devices is extreme. https://www.youtube.com/watch?v=a5Vv0JwezB0


    Z.
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    The initial post started talking about wall fans in timber framed houses. Normally these are situated on an outside wall so the ducting is very short and does not run through other people's property, especially in timber framed homes I imagine. In larger homes thing may be more complicated if air ducting runs through other people's homes or communal areas. The weak point is of course any plastic fan. In large buildings automatic fire stopper louvres can be installed in metal ducting, operated by electric motors, weights or springs.


    Fire dampers. https://en.wikipedia.org/wiki/Fire_damper


    Testing the devices is extreme. https://www.youtube.com/watch?v=a5Vv0JwezB0


    Z.
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