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From NFPA 72, 2002 Edition: “7.4.2.1* To ensure that audible public mode signals are clearly heard, unless otherwise permitted by 7.4.2.2 through 7.4.2.5, they shall have a sound level at least 15 dB above the average ambient sound level or 5 dB above the maximum sound level having a duration of at least 60 seconds, whichever is greater ...
A group of students at James Madison University evacuate their dorm rooms in response to a fire drill. The purpose of fire drills in buildings is to ensure that everyone knows how to exit safely as quickly as possible if a fire, smoke, carbon monoxide, or other emergency occurs, and to familiarize building occupants with the sound of the fire alarm.
Smoke detector mounted on a ceiling. A smoke detector is a device that senses smoke, typically as an indicator of fire.Smoke detectors/alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary.
A fire alarm system is a building system designed to detect, alert occupants, and alert emergency forces of the presence of fire, smoke, carbon monoxide, or other fire-related emergencies. Fire alarm systems are required in most commercial buildings.
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Traditional smoke detectors are ionization smoke detectors which create an electric current between two metal plates, which sound an alarm when disrupted by smoke entering the chamber. Ionization smoke alarms can quickly detect the small amounts of particles produced by fast-flaming fires, such as cooking fires or those fueled by paper or ...
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PASS device (personal alert safety system), also known as ADSU (automatic distress signal unit) – Device used to set off an alarm when a firefighter is in distress; SCUBA – Self-contained underwater breathing apparatus; Smoke hood, also known as Short Term Air Supply (STAS) – Device to protect the user from smoke inhalation in an emergency
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