How far must a spot-type detector be installed horizontally from a smoke damper within an air transfer opening?

Spot-type detectors are crucial in fire detection systems, as they respond quickly to smoke or heat in an area. The placement of these detectors is governed by codes and standards to ensure reliable operation. According to the National Fire Protection Association (NFPA) and relevant building codes, a specific distance is required for the installation of spot-type detectors in relation to smoke dampers, especially within air transfer openings.

The requirement to install a spot-type detector at least 5 feet away from a smoke damper is established to avoid false alarms and ensure accurate detection. Smoke dampers can alter airflows and potentially create conditions that may lead to smoke being drawn away from the detector or cause a delay in its activation. If the detector is too close to the damper, it might not adequately sense smoke that is further down the airflow path, which could impair the response time in an actual fire situation.

This 5-foot distance provides a balance between effective smoke detection and minimizing interference caused by the operation of the smoke damper. It ensures that the detector is positioned to receive smoke signals from the rest of the area it is meant to monitor, enhancing the overall safety and reliability of the fire alarm system.