... the cover, the control panel,the ESP (Electrostatic Precipitator) air filter, and other major components for maintenance and cleaning. 6. ... , etc. 7. Patentedcy lindrical honeycomb electric fields (electrostatic air filter) and optional PLC controlled spray-style humidifier, maximizing the ... 85%, based on 1 stage of electric field(electrostatic air filter), and above 95%, based on 2 stages of electric ...