These requirements cover electrostatic air cleaners rated at 600 volts or less@ intended to remove dust and other particles from the air and intended for use in accordance with the National Electrical Code@ ANSI/NFPA 70. These requirements do not cover electrostatic air cleaners for use in hazardous locations or to clean atmospheres defined as hazardous by the National Electrical Code@ ANSI/NFPA 70. These requirements do not cover air cleaners intended to remove particles other than dust and other particles normally found in heating and ventilating systems. Requirements for the installation of duct-type electrostatic air cleaners are included in the Standard for the Installation of Air Conditioning and Ventilating Systems@ NFPA 90A; and the Standard for the Installation of Warm Air Heating and Air Conditioning Systems@ NFPA 90B.