BS CP 413:1973
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Code of practice for ducts for building services
BSI Group , 10/31/1980
Pages: 33
Deals with the design and construction of subways, crawlways, trenches, casings and chases for the accommodation of services within buildings and external ducts. Position, dimensions, safety precautions and control of hazards. Fire precautions in builders’ or structural ducts and, as an appendix, fire precautions for ventilation ductwork.
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