What is the required distance from a door where a smoke detector must be located for closure activation?

In fire safety regulations and standards, smoke detectors must be installed at a specified distance from various obstructions, including doors, to ensure they function effectively during a fire event. The requirement of a distance of 5 feet from a door before a smoke detector is installed is designed to prevent false alarms and ensure that the detector responds appropriately to smoke that may enter the room.

When smoke detectors are too close to a door, particularly if the door is frequently opened, the airflow can disrupt the smoke detection process. This distance allows the smoke to accumulate and be detected without interference from the movement of the door. Proper placement of smoke detectors is crucial for early warning in case of a fire, which can save lives and property.

Thus, the requirement of 5 feet reflects the need for proper functionality and reliability of the smoke detection system.