NEMA 4-rated InnovairFlex™ watertight duct smoke detectors are built to operate in the most challenging conditions without the need for bulky or costly enclosures. The detectors can operate in airflow speeds from 100 to 4,000 fpm, temperatures from -4 to 158°F, and humidity ranges from 0 to 95 percent (noncondensing). In addition, a watertight, UV-resistant housing provides protection against falling dirt, rain, windblown dust, splashing, and hose-directed water. According to the manufacturer, the watertight models are compatible with all InnovairFlex accessories and include all the same time- and money-saving features as the entire InnovairFlex line, the company says.

System Sensor, 553 N. North Court, Ste. 110, Palatine, IL 60067; 800-736-7672;

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