These requirements apply to oil-fired unit heaters as defined herein. Unit heaters designed to supply heated air through ducts are covered in the Standard for Oil-Fired Central Furnaces@ UL 727. Requirements for the installation and use of oil-burning equipment are included in the Standard for the Installation of Oil Burning Equipment@ NFPA 31 and the BOCA National Mechanical Code. 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. If a value for measurement is followed by a value in other units in parentheses@ the second value may be only approximate. The first stated value is the requirement.