Air Supply is not a filtration device, and no parts need to be replaced or serviced. The same technological principles have only recently been miniaturized to allow for personal, portable use. Air Supply is a corona discharge device. An ionizer uses electrostatic precipitation to negatively charge particles. Although a corona discharge device has an ionization effect internally, it uses an electronic plasma incineration, similar to a lightening strike, to destroy airborne contaminants.
Corona discharge is able to destroy many more airborne contaminants than traditional ionization.
Air Supply emits less than 0.026 parts of ozone per million. Less than half of the permissible. There are other wearable air purifiers available but the operation of them compared to the Air Supply differ. I feel a slight breeze of air coming from my unit. No, there is NO fan.