Closed vent system
Closed vent system means a system that is not open to the atmosphere and is composed of piping, ductwork, connections, and, if necessary, flow inducing devices that collect or transport gas or vapor from an emission point to a control device.
Source
40 CFR § 63.12005
Scoping language
Terms used in this subpart are defined in the Clean Air Act, in 63.2, and in this section, as follows: