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Why Are Fire Alarms So Loud? | Fire Alarm Services MD, …
https://www.guardianfireprotection.com/blog/why-are-fire-alarms-loud/
The precise requirement is 15 dB above the average noise level or 5 dB above the maximum ambient sound, whichever is greater. This means it may be appropriate to program fire alarm horns to 75 dB for a restaurant or office setting, but an industrial facility with loud equipment may need to sound off closer to the maximum 120 dB level to ensure the sound stands out from …
How loud are fire alarms? - The Fire Alarm Supplier
https://thefirealarmsupplier.com/how-loud-fire-alarms-are/
How loud are fire alarms? In order to alert people, fire alarm horns and sirens should always be set to sound 15dB louder than the average ambient noise. This means that the appropriate level will be different in a school class as opposed to an industrial facility, for example.
FIRE ALARM CONCERNS Noise levels of alarms
https://www.safety.duke.edu/sites/default/files/firealarmconcerns.pdf
OSHA considers noise to be hazardous, i.e. at sound levels that cause permanent hearing loss, when exposures exceed 90 dBA averaged over an eight-hour day. Fire alarms are set at a maximum level of 120 dBA; however even at this high level, an individual’s true exposure is unlikely to approach the 90 dBA average due to:
Amazon.com: decibel alarm
https://www.amazon.com/decibel-alarm/s?k=decibel+alarm
Voice Evacuation Systems - Commercial Fire Alarm …
https://americanfirealarms.com/file.axd?file=%2f2014%2f06%2fVoice+Evacuation+Manual.pdf
If the two dB level are identical, then you simply add 3 dB to either one. If the SPL from one speaker is more than 10 dB higher than the other, then you can simply use the higher SPL dB value. rules of thumb pertaInIng to db Sound pressure levels drop by 6 dB for every dou-bling of distance and increase by 3 dB for every dou-bling of power.
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