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BS 2740:1969 Specification for simple smoke alarms and alarm metering devices
standard by BSI Group, 12/31/1969
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Requirements for the construction and operation of instruments designed to give an alarm when smoke emission from a chimney exceeds a chosen Ringelmann shade.Cross References:
BS 2741
BS 2742
Addendum No. 1 to BS 2742:1969
BS 2811