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 Standards of the National Fire Protection Association for Installation of Air Conditioning and Ventilating Systems@ NFPA 90A; and for Installation of Warm Air Heating and Air Conditioning Systems@ NFPA 90B. A product that contains features@ characteristics@ components@ materials@ or systems new or different from those covered by the requirements in this standard@ and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features@ characteristics@ components@ materials@ or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development@ revision@ and implementation of this standard.