... an Mini-HEPA Filter3rd stage consists of 2 Photocatalytic Filters (Titanium Dioxide (TiO2)4th stage comprises a UV ... Cabins, Auto, Bedroom, Living room, Cookroom, Hospital, Etc..·Filters: Cotton filtering effect early, HEPA Filter, Activated Carbon and ... Filters Life: Depending upon usage, Cotton filtering, HEPA and Carbon: 3 to 6 months, Photocatalytic: 12 months.·MOQ: 500pcs. negative ion air ...