The Intellia addressable duct detector housing EBI-50 provides early detection of smoke in the air moving through heating and ventilation (HVAC) ducts in commercial and industrial premises. Its purpose is to prevent the recirculation of smoke from an area on fire to areas unaffected by the fire. The duct detector housing is designed to accept an Intellia intelligent detector head (EDI-20 optical smoke detector). The smoke detector is designed to operate in ducts with a width of between 300 mm and 3000 mm. A sampling tube of 360 mm, suitable for duct width up to 540 mm, is supplied as standard. Longer sampling tubes for wider ducts may be ordered separately.