These requirements cover factory-built fireplaces@ including the fire chamber@ chimney@ roof assembly@ and other related parts that are entirely factory-made and that are intended for unit assembly in the field. These requirements cover factory-built fireplaces having a fire chamber intended to be operated either open to a room or@ when equipped with doors@ operated with the doors either open or closed. These requirements cover factory-built fireplaces intended for use with either solid wood or coal fuels. The factory-built fireplaces covered by these requirements are intended for installation in accordance with the National Fire Protection Association Standard for Chimneys@ Fireplaces@ Vents and Solid-Fuel Burning Appliances@ NFPA 211@ and in accordance with codes such as the BOCA Basic/National Code@ the Standard Mechanical Code@ and the Uniform Building Code. As covered by these requirements@ an air duct system portion of a circulating warm air type fireplace is intended for installation in accordance with the National Fire Protection Association Standard for Warm Air Heating and Air Conditioning Systems@ NFPA 90B. These requirements also cover fixed blowers@ and other electrical accessories for factory-built fireplaces@ rated at 600 volts or less@ and intended to be employed in specified locations in accordance with the National Electrical Code@ NFPA 70. The chimneys for factory-built fireplaces covered by these requirements comply with either a 1700??(927?? flue-gas temperature test or a 2100??(1149?? flue-gas temperature test@ at the manufacturer's option. 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.