ICC Commercial Building Inspector Practice Test

In the context of exits, what is the maximum delay permitted for automatic closing doors once a smoke detector is triggered?

1. 5 seconds

2. 10 seconds

3. 15 seconds

4. 20 seconds

The correct answer is: 10 seconds

The maximum delay permitted for automatic closing doors once a smoke detector is triggered is 10 seconds. This requirement is crucial in ensuring the effective operation of smoke and fire safety systems within commercial buildings. When a smoke detector is activated, it indicates the presence of smoke and potentially a fire, so a timely response from automatic closing doors helps in compartmentalizing the space and preventing the spread of smoke and flames. A delay beyond 10 seconds could provide sufficient time for smoke to spread, increasing the risk to occupants and complicating evacuation efforts. The 10-second limit strikes a balance between allowing for any possible false triggers—where the smoke might clear without needing the doors closed—and ensuring that the doors close quickly enough to enhance safety and protection features of the building's design. Thus, this standard is part of broader fire safety regulations and best practices to mitigate risks associated with fire events.