This model is normally used in bathroom or toilet locations. It is designed to run permanently, using a very low speed / power consumption and can automatically boost when condensation (humidity) is detected. Once this clears the fan reverts to the low speed. The constant volume technology automatically adjusts the speed of the fan to ensure the desired airflow is delivered. A silent high pressure axial impeller means Lo-Carbon dMEV can meet the requirements of many domestic installations without the need to use a traditional centrifugal fan.