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An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories, apartments, and hotels.
Modern exit signs are often combined with other safety devices, such as emergency floodlighting for supplementary area illumination. [13] Modern exit signs are also, to some degree, flame retardant. Exit signs draw a relatively small amount of power, and can generally be added onto any existing electrical circuit without adverse effects.
There are principally two types of overwing exits,excluding the full-sized door on the likes of the Boeing 747 and Boeing 777, which is not considered an overwing exit - referred to as a Type I or Type A exit) in use on modern aircraft. These disposable hatch type exits are called Type IIIA and Type IIIB exits.
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