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.
Vent Axia 475142A Lo-Carbon Continuous Running NBR dMEV 100mm Axial Extract Fan
Vent-Axia 498095 Lo-Carbon NBR dMEV 100mm Extractor Fan
Vent Axia Lo Carbon NBR DMEV C 100 Continuous Extract Filterless Fan 498095
Vent Axia 494148 Lo-Carbon 125mm NBR DMEV Humidistat Fan
Vent-Axia 498096 Lo-Carbon NBR dMEV Extractor Fan 100mm Humidistat / Timer
Vent Axia 498095 NBR dMEV C100 Low Carbon Continuous Extract Filterless Fan