Inim EBDDHN ventilation duct detector adapter. The adapter is suitable for any type of optical smoke detector (analog or conventional). The detector base (not included) is held in place by two screws (included). It provides early warning of smoke by continuously sampling air in heating and ventilation ducts. It operates at air speeds of 0.5 m/s to 20 m/s. NOTE: The adapter is supplied without a tube; this must be provided separately !