Means of egress provided through stockrooms in Group M occupancies are not prohibited where:

In Group M occupancies, which typically involve mercantile facilities, means of egress must meet specific safety requirements to ensure a safe exit during emergencies. The correct choice encompasses all the listed criteria, each of which plays a critical role in maintaining safety standards regarding egress.

Having stock in a retail environment means that there needs to be careful planning of exits. For example, if the stock in a stockroom is of the same hazard classification as that in the main retail area, it minimizes the risk of introducing more hazardous materials into the exit path. This uniformity in classification helps ensure that the egress routes are not compromised by increased risk.

Limiting the exit access through the stockroom to no more than 50% ensures that a substantial portion of egress routes remains clear and accessible to occupants. This regulation helps prevent bottlenecks and ensures that patrons and employees have adequate routes to safety, especially in urgent situations.

Furthermore, ensuring that the stockroom is not subject to locking from the egress side is crucial. This means that people can exit freely without being hindered by locked doors, which is essential in an emergency when swift evacuation is necessary.

In summary, the overall guidelines establish practical safety parameters that reflect a comprehensive approach to ensuring that