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The Zeta ZT-DU2 is a duct unit enclosure designed to monitor smoke in ventilation ducts using a smoke detector mounted outside the duct in a sealed chamber. For reliable detection, the airspeed in the duct must be at least 2.5 m/s. The unit can be powered by either 230V AC or a separate 24V power supply and includes Form C relay outputs for alarm and fault conditions.
Key features include Fire and Fault relays, options for latching or non-latching reset, and a manual reset for the latching option.