Reduces noise on the fly

Previously the AHU’s fan motor was run at constant speed but generated high noise levels. By using a 5.5kW ABB HVAC drive at 39Hz, the same flow rate can be obtained at a lower motor speed, resulting in a reduction in noise from 80 dBA to 73 dBA.

Reducing the unwanted background noise generated by the supply fan has made it easier for the crew to hear conversations and spoken instructions.