Best answer: How should a fire alarm sound?

When the fire alarm is activated, building occupants will hear a horn which will sound FOUR-FOUR-FOUR (4-4-4). The duration of this signal will be approximately fifteen (15) seconds. A pre-recorded voice message (female voice) will be heard over the building intercom system.

What sound does a fire alarm sound like?

If your smoke alarm detects smoke, it will sound a very loud, 3-beep alarm pattern. Don’t panic; stay calm. Follow your family escape plan.

How does a fire alarm produce sound?

Smoke alarms (both the ionization and photoelectric types) use a common piezoelectric horn, as shown in Figure 1, to indicate to an occupant that the smoke alarm has activated. The sound source for a piezoelectric horn is the piezoelectric diaphragm.

How loud is a fire alarm?

Noise levels of alarms

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: Distance away from the alarm – noise levels fall off as the square of the distance.

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Why are fire alarms so loud?

The high volume requirement for fire alarms accounts for the fact that distance from the horn decreases its perceived volume, and building materials absorb noise, especially if the doors are closed between rooms.

How often does a fire alarm beep?

Consistent Chirping

An alarm will chirp every 30 to 60 seconds for a minimum of seven days. With a “low battery” announcement, disconnect the unit and replace the batteries.

Do all fire alarms have to sound the same?

All fire alarm sounders in a building should produce the same sound, distinct from any other audible warning devices in the building.

Can fire alarms be too loud?

In the United States, a typical fire alarm sounds off between the 65 decibel and 120 decibel range. According to the National Institute on Deafness and Other Communication Disorders (NIDCD), repeated exposure to sound at 85 decibels or above can be enough to cause hearing loss.

How loud should an alarm be?

Note: Alarm sounders that are too loud may be dangerous and cause panic, discomfort and make communication very difficult. As guidance, the overall alarm level should be a maximum of 10 to 15 dB(A) over the ambient background noise.

How do I make my fire alarm less loud?

If you live in an apartment or record in a busy environment, then the sounds of a nearby speaker can be annoying and distracting. By muffling your speaker using acoustic or polyurethane foam, you can dampen the sound. Tape, pillows, rags, or stuffed animals also work.

What is the fear of fire alarms called?

The term phonophobia comes from Greek φωνή – phōnē, “voice” or “sound” and φόβος – phobos, “fear”. Ligyrophobics may be fearful of devices that can suddenly emit loud sounds, such as computer speakers or fire alarms.

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Can fire alarms cause ear damage?

Yes. Being exposed to a loud noise, such as a fire alarm, for more than a brief time can damage your hearing. A single exposure as you describe should result in short term temporary damage. The damage should heal and go away on its own.

What does 120 decibels sound like?

Comparative Examples of Noise Levels

Noise Source Decibel Level
Thunderclap, chain saw. Oxygen torch (121 dB). 120
Steel mill, auto horn at 1 meter. Turbo-fan aircraft at takeoff power at 200 ft (118 dB). Riveting machine (110 dB); live rock music (108 – 114 dB). 110