The unlatching of any door or leaf must not require more than how many operations?

The requirement that the unlatching of any door or leaf must not require more than one operation is grounded in safety and accessibility standards. This is particularly important in commercial buildings where quick egress can be necessary during emergencies. A single operation simplifies the process, allowing individuals to exit rapidly without fumbling with multiple actions, which can be crucial in panic situations.

This requirement is codified in many building codes and fire safety regulations to ensure that doors designed for egress are user-friendly for everyone, including those with disabilities. Having a door that unlatches in one action enhances its usability and efficiency, contributing to a safer environment in commercial spaces. Doors that require more than one operation can increase the risk of individuals getting trapped or delayed during emergencies, which is why the standard is set to just one operation.