Space heater
Space heater means a unit that meets the requirements of 40 CFR 279.23. A space heater is not an incinerator, a waste-burning kiln, an energy recovery unit or a small, remote incinerator under this subpart.
Source
40 CFR § 60.2265
Scoping language
Terms used but not defined in this subpart are defined in the Clean Air Act and subpart A (General Provisions) of this part.