The Federal Signal Model FSF107 4–Wire Smoke Detector is a photoelectric device capable of sensing smoke in air velocities from 100 to 4,000 feet per minute. This Low–Flow technology enables duct smoke detection throughout a broad range of airflow environments. Many difficult to solve HVAC applications occur in low air–flow duct applications where reliable smoke detection is critical.

Two form C relay contacts provide reliable performance for the management of fans, blowers, and air conditioning systems. These devices can then be configured to prevent the spread of toxic smoke and fire gasses through a protected area.

The FSF107 has been designed for simplified installation and easy maintenance. The modular construction allows for easy cleaning and uncomplicated field replacement of the power and sensor boards. The patented "cover missing" feature insures the cover is securely tightened following routine cleaning and maintenance. The patented interconnectability feature allows multiple FSF107's to communicate with each other. In the event smoke is detected, the FSF107 will signal the remaining detectors to initiate their relays for smoke control. A five foot metal sampling tube is an optional accessory available under part number FSF108.