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Airstream ACE H 75dia Mechanical Extract Ventilation Unit (EC Motor, Humidistat) BMS capability Volt free contact boost capability Fully controllable by airstream ACE wall switch Overrun timer can be set to suit occupant requirements from 1-100 minutes. The overrun can be triggered from the ACE wall switch or any 230 volt input.... Airstream ACE H 75dia Mechanical Extract Ventilation Unit (EC Motor, Humidistat)