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SOUNDERS
The minimum sound level of a sounder device should be 65dB(A) or 5dB(A)
above a background noise which is louder than 60dB(A) (if lasting more than
30 seconds) and at a frequency of between 500Hz and 1000Hz. The maximum
sound level should not be greater than 120dB(A) at any normally accessible
point. Sounder volume may be reduced to 60dB(A) in stairways, enclosures up to
60m and specific points of limited extent.
Sounder device cabling should be arranged so that in the event of a fault at least
one sounder will remain operational during a fire condition.
For areas where people are sleeping, sounder devices should produce a minimum
of 75dB(A) at the bed-head with all doors shut.
Decibel loss occurs through doors. Approximately -20dB(A) through a normal
door, and approximately -30dB(A) through a fire door.
65dB(A) @ 500Hz to 1000Hz
Background Noise
+5dB(A) @ 500Hz to 1000Hz
Fire Door
-30dB-20dB
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