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  • Environmental emergency alarms designed to activate audible (i.e., sound) and/or visual warnings when carbon monoxide (CO) beyond a threshold level in a closed environment is detected. These alarms usually consist of a CO detector (e.g., tin oxide), appropriate transducers to generate an electrical signal, amplifiers, separate electric power systems and/or batteries, and sound and/or light sources that deliver signals (e.g., high-pitched sounds, intense flashing lights) to warn people that high CO levels are present. CO alarms intended to be fixed in a particular room providing only emergency signals locally and alarm systems intended for a complete facility that may also include remote alarms (e.g., police and/or fire stations) are available. CO alarms are usually required in facilities that use fuel-burning appliances such as furnaces, ranges, water and room heaters, motor-powered equipment such as portable generators, and/or fireplaces, and other charcoal-burning devices used in homes and other enclosed areas.
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