In the design of the auditorium, there is a need to meet the acoustic requirements. Timber was then considered as a preferred material for use. The above clause provides the relaxation for the use of timber as wall linings, provided the aggregate area of the timber linings does not exceed 50% of the whole surface area of the side walls of the auditorium. The other reason for the above relaxation is that each auditorium is required to be constructed as a fire compartment.
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In the above diagram there are two compartments. Each compartment can have a total of 60m of combustible wall finishes of not lower than Class 3. Subsequently, if the compartment wall is removed, there is a need to review the provision of wall finishes, subject to the total wall finishes to the whole floor shall not exceed 60m. Area of wall finishes in excess of 60m is required to be removed.
The above clause is intended for lighting diffuser Any part of a ceiling to circulation space e.g. corridor can have not lower than Class 3 flame spread, provided each part shall not exceed 2.5m and is separated from other such part by minimum 3.5m.
The purpose of BS476 Part 24 (1987) and ISO6944 (1985) is to measure the ability of a ductwork system to resist the spread of fire, from one fire compartment to another, without the aid of fire dampers. It should be noted that the test relates to a complete ductwork installation and therefore joints, supports and the fire stopping through the furnace wall all form an integral part of the test.
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