Process or production unit
Process or production unit means any collection of structures and/or equipment, that processes assembles, applies, or otherwise uses material inputs to produce or store an intermediate or final product. A single facility may contain more than one process or production unit.
Source
40 CFR § 63.41
Scoping language
Terms used in this subpart that are not defined in this section have the meaning given to them in the Act and in subpart A.