What is the key requirement for smoke alarms installed near open stairways?

The key requirement for smoke alarms installed near open stairways is that they should not be affected by doors. This is crucial because doors can create barriers that may prevent smoke from reaching the smoke alarm in a timely manner. If a smoke alarm is installed in a location where doors could close it off from smoke that would otherwise trigger the alarm, there is an increased risk of delayed detection in the event of a fire.

This requirement ensures that smoke may flow freely towards the alarm, allowing it to perform its critical life-saving function effectively. The surrounding design, including how doors operate in relation to the stairwell and smoke paths, plays a significant role in ensuring that smoke alarms provide early warnings in emergency situations.

Understanding this can help fire alarm technicians make informed decisions about the placement and type of smoke alarms they install, ensuring compliance with safety codes and enhancing overall fire safety.