The Innovair(r) duct-mounted smoke detector from System Sensor (Palatine, IL), features low-flow technology, which allows for smoke detection in airspeeds as low as 100 fpm to 4,000 fpm. This includes locations where slow moving air is present, such as variable-air volume boxes and fire/smoke dampers. The unit is available in both two- and four-wire photoelectric versions and offers a full range of input power options including 24 vac/dc or 110/220 vac.