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In April of 2006, The Fire Protection Research Foundation was awarded
a Fire Prevention and Safety Grant by the US Fire Administration to
study the effectiveness of alarms for emergency notification. Below
are some excerpts from this 100 page research document. The full
document can be download or sent to by email.
Waking effectiveness of Alarms
“ Under the testing conditions a 520 Hz square wave T-3 sounds was the
single most effective signal, awakening 92%...significantly more effective
than the 3100 Hz pure tone T-3 sound , which awoke 56%.” page 9
“In some cases a smoke alarm may not arouse the sleeping occupants in
time to escape and a lack of response, or a delayed response clearly
increases the chances of dying in a fire” (Thomas and Brennan, 2004)
Page 14
“Interesting the same 520 Hz square wave signal has also been found to be
more effective at waking sleeping children (Bruck, Reid, Kouzma and Ball
2004) page 18
Standard Smoke and Carbon Monoxide Alarms
are based on 3100 HZ