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Emergency exit in Universitetet metro station in Stockholm. An emergency exit in a building or other structure is a special exit used during emergencies such as fires.The combined use of regular and emergency exits allows for faster evacuation, and emergency exits provide alternative means of evacuation if regular exits are inaccessible.
Ingress, egress, and regress are legal terms referring respectively to entering, leaving, and returning to a property or country. The term also refers to the rights of a person (such as a lessee ) to do so as regards a specific property.
The phrase "means of egress" refers to the ability to exit the structure, primarily in the event of an emergency, such as a fire. Specifically, a means of egress is broken into three parts: the exit access, the exit, and the exit discharge (the path to a safe area outside).
As building codes evolved and more safety concerns were addressed over subsequent editions, all construction above a certain number of stories was required to have a second means of egress, and external fire escapes were allowed as a retrofit option for existing buildings prior to the post-World War II period.
The purpose of building codes is to provide minimum standards for safety, health, and general welfare including structural integrity, mechanical integrity (including sanitation, water supply, light, and ventilation), means of egress, fire prevention and control, and energy conservation. [9] [10] Building codes generally include:
Means of egress: The way out of a building during an emergency; may be by door, window, hallway, or exterior fire escape; local building codes will often dictate the size. location and type according to the number of occupants and the type of occupancy. Multiple alarms: A request by an incident commander for additional personnel and apparatus ...
An example is the interior of a storage tank, occasionally entered by maintenance workers but not intended for human occupancy. Hazards in a confined space often include harmful dust or gases , asphyxiation , submersion in liquids or free-flowing granular solids (for example, grain bins ), electrocution , or entrapment .
In human speech, egressive sounds are sounds in which the air stream is created by pushing air out through the mouth or nose. The three types of egressive sounds are pulmonic egressive (from the lungs), glottalic egressive (from the glottis), and lingual (velaric) egressive (from the tongue).