Bosch D341 Four-wire Duct Smoke Detector Housings None

For 1 ft. (30.5 cm) to 10 ft. (3 m) ducts with air velocity between 300 ft./min. to 4000 ft./min. (1.52 m/s to 20.3 m/s) Easy duct tube installation through the housing cuts installation time Detector test and reset without removing covers Clear cover allows quick visual inspection Tube filters, dust immune smoke detector, and easy disassembly for cleaning reduce maintenance time and cost Material Plastic Operating relative humidity, non-condensing (%) 0 – 95 % Operating temperature (°C) 0 – 49 °C