Section 279.61 - Restrictions on burning(a) Off-specification used oil fuel may be burned for energy recovery in only the following devices:(1) Industrial furnaces identified in § 260.10 of this chapter;(2) Boilers, as defined in § 260.10 of this chapter, that are identified as follows: (i) Industrial boilers located on the site of a facility engaged in a manufacturing process where substances are transformed into new products, including the component parts of products, by mechanical or chemical processes;(ii) Utility boilers used to produce electric power, steam, heated or cooled air, or other gases or fluids for sale; or(iii) Used oil-fired space heaters provided that the burner meets the provisions of § 279.23 ; or(3) Hazardous waste incinerators subject to regulation under subpart O of parts 264 or 265 of this chapter.(b)(1) With the following exception, used oil burners may not process used oil unless they also comply with the requirements of subpart F of this part.(2) Used oil burners may aggregate off-specification used oil with virgin oil or on-specification used oil for purposes of burning, but may not aggregate for purposes of producing on-specification used oil.