Comprehensive definitions of 46+ OSHA workplace safety terms, evacuation terminology, and emergency planning concepts with regulatory references.
A continuous and unobstructed way of exit travel from any accessible point in a building to a public way. This must be usable by individuals with disabilities and includes accessible routes, areas of refuge, and accessible exit discharge.
An employee alarm system that uses a distinctive signal for each purpose and complies with OSHA requirements. The alarm must be capable of being perceived above ambient noise levels and must be distinctive enough to be recognized as a signal to evacuate.
A protected space along the path of egress travel where people who are unable to use stairs can remain temporarily to await evacuation assistance. These areas must be sized to accommodate wheelchair users and provide fire-rated protection.
A designated outdoor location where employees gather after evacuating a building during an emergency. Assembly points must be at a safe distance from the building, clearly marked, and allow for headcount verification. Also known as a muster point or evacuation assembly area.
An integrated system of underground and overhead piping designed to automatically discharge water when activated by heat from a fire. OSHA requires employers to properly maintain sprinkler systems and ensure they meet NFPA 25 standards.
A type of explosion that occurs when a pressurized vessel containing liquid above its boiling point ruptures. BLEVEs require immediate evacuation of surrounding areas and specialized emergency response procedures.
The unobstructed horizontal measurement of an exit component, such as a door or corridor. OSHA requires exit routes to maintain a minimum clear width of 28 inches at all times, with doors providing at least 32 inches of clear width.
Materials that are capable of igniting and burning when exposed to fire. OSHA prohibits storing combustible materials in exit routes and requires proper housekeeping to minimize fire hazards.
An enclosed exit access component that defines and provides a path of egress travel to an exit. Exit access corridors must meet specific width, construction, and ventilation requirements under OSHA regulations.
A corridor or passageway that allows travel in only one direction. OSHA limits dead-end corridors to 50 feet maximum in buildings without sprinkler systems, or as permitted by local codes for sprinklered buildings.
The act of exiting or the path by which occupants leave a building or structure during normal or emergency situations. Egress is a fundamental concept in fire safety and building codes, encompassing all components of the exit system.
A written document required by OSHA that describes the actions employers and employees must take to ensure employee safety during workplace emergencies. Must include evacuation procedures, escape routes, procedures for employees who remain to operate critical equipment, and rescue/medical duties.
The organized movement of people away from a threatening or hazardous situation to a place of safety. Emergency evacuations must be conducted according to the established Emergency Action Plan and may be triggered by fire, chemical spill, natural disaster, or other emergencies.
A diagram or floor plan showing the layout of a building, including exit routes, emergency equipment locations, assembly points, and "You Are Here" indicators. While not explicitly required by OSHA, evacuation maps are recommended best practice and may be required by local fire codes.
Written instructions detailing the specific steps employees must follow when an evacuation is ordered. These procedures must be included in the Emergency Action Plan and communicated to all employees during training.
The designated path that building occupants follow from their work area to an exit and then to an assembly point. Evacuation routes must be clearly marked, properly illuminated, and kept free of obstructions at all times.
The portion of an exit route that is generally separated from other areas of the building by fire-resistant construction. An exit provides a protected way of travel to the exit discharge. Examples include exterior exit doors, exit stairways, and horizontal exits.
The portion of an exit route that leads to an exit. Exit access includes corridors, aisles, rooms, and any other portion of the building that occupants travel through to reach an exit.
The portion of an exit route that leads directly from the exit to a public way or to an open area with access to a public way. Exit discharge must be at grade level and provide a safe path away from the building.
A continuous and unobstructed path of exit travel from any point within a workplace to a place of safety. An exit route consists of three parts: exit access, exit, and exit discharge. Must be at least 28 inches wide.
A sign mounted above or adjacent to an exit door that clearly identifies the exit. OSHA requires exits to be marked by a readily visible sign with the word "EXIT" in letters at least 6 inches high. Signs must be illuminated to at least 5 foot-candles.
A manually operated device that allows building occupants to activate the fire alarm system. Pull stations must be located along natural paths of egress and be easily accessible, typically mounted 42-48 inches above the floor.
A practice evacuation exercise designed to prepare building occupants to respond appropriately during an actual emergency. Fire drills test the effectiveness of evacuation procedures and help identify problems with exit routes or emergency equipment.
An exit specifically designed for use during fire emergencies. Fire exits must be clearly marked, properly maintained, and provide direct access to the exterior or to a protected area of refuge.
A portable device used to put out small fires. OSHA requires fire extinguishers to be easily accessible, properly maintained, and located so that maximum travel distance does not exceed 75 feet for Class A hazards or 50 feet for Class B hazards.
A written document describing the fire hazards of the materials and processes in the workplace, and how to control these hazards. Required by OSHA when fire extinguishers are required or when the emergency action plan requires total evacuation.
An engineered system designed to detect and suppress fires using water, chemical agents, or inert gases. Includes automatic sprinkler systems, clean agent systems, and specialized systems for kitchens, data centers, or manufacturing processes.
A scaled diagram showing the layout of a building floor from above, including walls, doors, windows, and other architectural features. Floor plans are the basis for creating evacuation maps and conducting emergency planning.
Any substance or material that poses an unreasonable risk to health, safety, or property during transportation or storage. OSHA requires special evacuation procedures and training for workplaces with hazardous materials.
A way of passage from one building to an area of refuge in another building on approximately the same level, or from one fire compartment to another. Horizontal exits provide refuge areas for mobility-impaired occupants.
The practice of maintaining a clean, organized, and orderly workplace. Good housekeeping is essential for fire prevention and maintaining clear exit routes. OSHA requires exit routes to be kept free of obstructions and explosive/flammable materials.
An exit sign that is internally or externally illuminated to ensure visibility. OSHA requires exit signs to be illuminated to a surface value of at least 5 foot-candles and have letters at least 6 inches in height.
Safety procedures used to ensure that dangerous machines are properly shut off and unable to start up unexpectedly during maintenance. During emergencies, LOTO procedures may need to be modified to facilitate rapid evacuation.
A continuous and unobstructed way of exit travel from any point in a building to a public way. The means of egress comprises the exit access, the exit, and the exit discharge. This is the complete path from any location to safety.
A designated outdoor location where evacuees gather for headcount and accountability. Also referred to as an assembly point or rally point. Must be at a safe distance from the building and marked on evacuation maps.
The total number of persons that may occupy a building or space at any one time. Occupant load determines the required number and width of exits as specified in building and fire codes.
Door hardware that allows rapid egress by pushing against a horizontal bar or pad. Required on exit doors serving rooms with occupant loads of 50 or more. Allows doors to be opened quickly during emergencies without special knowledge.
An exit route enclosed by fire-resistant construction that provides protection from fire and smoke. Protected paths of travel allow occupants to safely exit a building even when a fire is present in other areas.
A street, alley, or other parcel of land open to the outside air leading to a public street that is permanently appropriated for public use. Exit routes must provide access to a public way.
A space along the path of egress travel where people unable to use stairs can safely wait for evacuation assistance. Must provide fire-rated protection, two-way communication, and adequate space for wheelchair users.
A door equipped with a device that automatically closes the door after it is opened. Fire-rated doors in exit routes must be self-closing to maintain the fire barrier and protect the exit route.
An emergency procedure where occupants remain indoors in a protected area rather than evacuating. Used during chemical releases, severe weather, or active threats. Must be addressed in the Emergency Action Plan.
A continuous membrane designed to restrict the movement of smoke. Smoke barriers divide large areas into smaller compartments and protect exit routes from smoke infiltration during fires.
The measurement of the path of travel from the most remote point in a building to the nearest exit. OSHA and building codes limit travel distance based on building type, hazard classification, and sprinkler protection.
The requirement that buildings have at least two separate and remote exit routes to provide alternative escape paths if one becomes blocked. OSHA requires at least two exit routes unless the building size and occupant load allow for a single exit.
A marker on an evacuation map showing the viewer's current location within the building. This essential element helps occupants quickly orient themselves and identify the nearest exit routes.
Egress refers to the general act of exiting or leaving a building. Means of egress is a more specific term defined by OSHA (29 CFR 1910.35) as the complete, continuous, and unobstructed path of exit travel from any point in a building to a public way. The means of egress includes three parts: exit access, exit, and exit discharge.
OSHA requires at least two exit routes to be available in a workplace to permit prompt evacuation during an emergency (29 CFR 1910.36(b)). However, a single exit may be permitted if the number of employees, building size, and arrangement of the workplace allow everyone to safely evacuate. Additional exits are required based on occupant load and travel distance requirements.
According to OSHA 29 CFR 1910.36(g), exit routes must be at least 28 inches wide at all points along the route. The ceiling height must be at least 7 feet 6 inches. Any projection from the ceiling must not reach a point less than 6 feet 8 inches from the floor. Exit doors must provide at least 32 inches of clear width.
OSHA does not explicitly require evacuation maps in the federal regulations. However, OSHA's Emergency Action Plan standard (29 CFR 1910.38) requires employers to have procedures for emergency evacuation and to designate assembly locations. Evacuation maps are a best practice for communicating this information and may be required by state or local fire codes.
While OSHA doesn't mandate specific map contents, best practices include: primary and secondary exit routes, "You Are Here" indicator, fire extinguisher locations (within 75 ft travel distance per OSHA 1910.157), fire alarm pull stations, assembly point locations, ADA-accessible routes, emergency phone numbers, and the date of last update. Many local fire codes specify additional requirements.
An area of refuge is a protected space along the path of egress where people unable to use stairs (such as individuals with mobility impairments) can safely wait for evacuation assistance. These areas must provide fire-rated protection, two-way communication with emergency responders, and adequate space for wheelchair users. They are required by ADA and NFPA 101 Life Safety Code.
OSHA requires employers to train employees when the Emergency Action Plan is developed or updated, when employee responsibilities change, and when the plan changes (29 CFR 1910.38(e)). While OSHA doesn't specify drill frequency, NFPA 101 and many local codes require annual fire drills for most occupancies, with some high-hazard or high-occupancy facilities requiring more frequent drills.
The terms are often used interchangeably, but technically a fire exit is specifically designed for evacuation during fires with fire-rated construction and protection. Emergency exit is a broader term that encompasses any exit used during emergencies, including fires, chemical releases, severe weather, or other hazards. All fire exits are emergency exits, but not all emergency exits have fire-rated protection.
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