Notifier FSL-751DNR Series High Sensitivity Duct Detector

The FSL-751DNR(A) high sensitivity duct smoke detector provides dependable performance for management of fans, blowers, and air conditioning systems by using an intelligent laser smoke sensor residing in an efficient housing design that samples air currents passing through a duct. The twist-in, twist-out FSL-751DNR high sensitivity laser smoke detector head allows easy removal for quick cleaning, maintenance, and replacement without removing the duct housing. The laser detector achieves sensitivities as low 0.02 percent-per-foot by using a laser diode instead of a standard LED light source in the sensing chamber. Many sensitive areas cannot tolerate even small amounts of smoke. This FSL-751DNR detector is designed to protect valuable assets and operations where systems must remain online at all times. Some ideal applications for the FSL-751DNR high sensitivity duct smoke detector include:

• Telecommunications switching facilities
• Cellular telephone infrastructure
• Integrated circuit fabrication facilities
• Computer rooms
• Clean rooms

NFPA 76, Section 8.5.3.1.2.3 Very Early Warning Fire Protection, calls for sensors to be mounted at the return air location for a space in the following instances:

• “Where stand-alone packed HVAC units are installed, sensors or ports shall be installed where return air is brought back to the unit.”
• “Sensors or ports shall be installed such that each covers no greater than 0.4 m2 (4 ft2) of the return air opening.”

The FSL-751DNR high sensitivity duct smoke detector is designed to satisfy NFPA 76 for Very Early Warning Fire Protection.