These requirements cover room heaters which are freestanding fire chamber assemblies of the circulating or direct radiation type. These products are for attachment to a residential type chimney intended for use with low-heat appliances and shall be used to burn solid fuels specified by the manufacturer. These products shall be manually or thermostatically controlled. Room heaters are intended for installation in accordance with the Standard for Chimneys@ Fireplaces@ Vents@ and Solid-Fuel Burning Appliances@ NFPA 211@ and in accordance with codes such as the BOCA National Mechanical Code@ the Standard Mechanical Code@ and the Uniform Mechanical Code. Room heaters intended for use in mobile homes are to be installed in accordance with the Mobile Home Construction and Safety Standards published by the Department of Housing and Urban Development (HUD). The product shall include: a) A field-installed cord-connected or permanently-connected blower assembly; and b) Other field-installed electrical accessories@ rated at 250 volts or less@ and intended to be employed in locations in accordance with the National Electrical Code@ NFPA 70. 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@ electric shock@ or injury to persons shall be evaluated using the appropriate additional component and end-product requirements to determine that the level of safety as originally anticipated by the intent of this Standard is maintained. A product whose features@ characteristics@ components@ materials@ or systems conflict with specific requirements or provisions of this Standard shall not be judged to comply with this Standard. Where appropriate@ revision of requirements shall be proposed and adopted in conformance with the methods employed for development@ revision@ and implementation of this Standard.