The InnovairFlex™ Series are the only duct smoke detectors flexible enough to fit configurations from square to rectangular and everything in between. Main Features 4-Wire Photoelectric, integrated low-flow technology Air velocity rating from 100'/min to 4,000'/min (0.5 m/s to 20.32 m/sec) Versatile mounting options: square or rectangular configuration Plug-in sensor offers superb false alarm immunity and the latest sensor technology Broad ranges for operating temperature (–4°F to 158°F) and humidity (0% to 95% non-condensing) Rotary address switches Patented sampling tube installs from front or back of the detector with no tools required Increased wiring space with a newly added 3/4-inch conduit knockout One easy-access Test/Reset button and improved LED status Patented interconnect feature for multi-fan shutdown