... unit .Super purification3 stage air purification: coarse filter, electrostatic cleaner, HEPA filters. It can reach 99.99% air ... low CostExcellent life cycle cost; replacement interval of HEPA filters is three times longer, low maintenance cost ... humidity13 Electrostatic dust cleaner14 HEPA filter15 Differential pressure switch Applinace:apartment ,resturant.hotel.bank.classroom,hospital,nursery school ...