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Member - 131 posts
Nigel
I'm very sorry it has taken us so long to respond fully to your online advcie query. Hopefully the answer that another Workplace Law member posted in the forum was of help (http://www.workplacelaw.net/forum/thread.php?thread_id=1899) - it certainly tallied with what our research found.
None of the manufacturers we tried to contact could provide more useful guidance than what's in Part B of the Building Regulations.
Regards
Gillian Nightingale
Membership Services Manager
Member - 185 posts
Hi Nigel,
got a bit of time on my hands so I thought I would see what's in the regs for you.
Part B: Means of Venting
Smoke venting may be by natural or mechanical means.
Natural smoke venting may be achieved by providing smoke outlets which conform to the following recommendations.
Total clear cross-sectional area of all the smoke outlets should be at least 2.5% of the floor area of the storey they serve.
Places of special fire risk should be provided with separate outlets.
Outlets should be positioned so that they do not compromise escape routes from the building.
Outlets which terminate the readily accessible positions maybe covered by pavement lights, stallboards or panes which can be broken out or opened. They should be suitably marked to indicate their position.
Outlets which terminate is less accessible positions should be kept unobstructed and should only be covered by a louver or grille which is non-combustible.
Smoke outlets should be sited at high level (i.e. in the ceiling or wall of the space they serve) and should be distributed evenly around the perimeter of the building so as to discharge into open air outside the building.
Basically in answer to your question all that is stated in the regs is that they should be constructed out of a non-combustible material.
Having said that there may be something in EU or British standard regarding their manufacturing process. Is there a manufacturers name on the vents or in your O&M's that you could refer to?
Member - 1 post
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