In a single blind hoistway, where is the emergency door located?

In the context of a single blind hoistway, the emergency door is stipulated to be located at every third floor. This requirement is in place to ensure that, in the event of an emergency, accessibility and egress are facilitated at reasonable intervals. The spacing of every third floor helps to balance the need for direct access with the practicalities of elevator design and safety protocols.

This configuration also aids emergency responders by providing access points at systematic intervals throughout the hoistway, preventing excessive distance between exits.

For reference, locating emergency doors at every second or fourth floor would either increase the frequency of access points more than necessary or reduce them to a level that could impede quick access during emergencies, which compromises safety. Thus, the designation of every third floor aligns with safety regulations and practical emergency response considerations in elevator systems.