How would you define the fire resistance of a hoistway door?

The fire resistance of a hoistway door is defined by the amount of time it can maintain its structural integrity and prevent the passage of fire and smoke. A hoistway door that can withstand fire for 1 1/2 hours is designed to provide a significant level of fire protection, ensuring safety during emergencies. This duration is often specified in building codes and fire safety regulations, catering to the need for containment during a fire incident, allowing people to evacuate and giving firefighters time to manage the situation.

In the context of hoistway doors, being able to withstand fire for 1 1/2 hours means that they are appropriate for multi-story buildings, offering critical safety features for both passengers and emergency responders. This level of fire resistance is crucial for maintaining safe egress routes and protecting vertical shafts that could otherwise become avenues for fire spread.