The Plane Clean Air™ easily attaches to the overhead air nozzle and prevents 99.5% of allergens, airborne viruses, bacteria and other particulate matter from the flowing air stream from going into the passengers face. At the end of the flight the device can be easily removed and placed in its convenient storage case for future usage. Meets FAA certification requirements. Each unit comes complete with two filters and two adhesive gaskets. A gasket and filter will last approximately eight flights. Under normal usage the unit will last five years.