Voluntary certification program
Voluntary certification program means an optional engine certification program that manufacturers of stationary SI internal combustion engines with a maximum engine power greater than 19 KW (25 HP) that do not use gasoline and are not rich burn engines that use LPG can choose to participate in to certify their engines to the emission standards in 60.4231 or (e), as applicable.
Source
40 CFR § 60.4248
Scoping language
As used in this subpart, all terms not defined herein shall have the meaning given them in the CAA and in subpart A of this part.