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The minimum width requirement for a commercial exit door is 36 inches. This width is established to ensure that there is adequate space for people to exit a building quickly and safely, especially in emergencies when large groups may need to evacuate simultaneously. A 36-inch door width facilitates easier passage for individuals, including those who may be using mobility aids or are part of the elderly or physically impaired population.

Additionally, this requirement is in line with safety codes, such as those referenced by the International Building Code (IBC) and National Fire Protection Association (NFPA) regulations, which emphasize that egress routes must be designed to handle the expected number of occupants efficiently. Wider doors help to minimize congestion and the risk of injury during an evacuation.

In comparison, narrower widths could hinder egress and compromise safety. For example, an exit door that is only 28 inches or 32 inches may not provide sufficient room for all occupants in a hospitality or commercial setting during emergencies. Therefore, the standard of 36 inches is essential for maintaining safety and accessibility in commercial spaces.