NEMA 4-rated InnovairFlex watertight duct smoke detectors operate in the most challenging conditions without the need for bulky enclosures. They can operate in airflow speeds from 100 to 4,000 feet per minute, temperatures from -4°F to 158°F and humidity ranges from 0 to 95 percent (non-condensing). Its watertight, UV-resistant housing provides protection against falling dirt, rain, windblown dust, splashing and hose-directed water. More information can be found at

System Sensor, 3825 Ohio Ave., Saint Charles, IL 60174; 800-736-7672 or 630-377-6674; 630-377-7871 (fax);;