Add-on air pollution control device
Add-on air pollution control device means equipment installed at the end of a process vent exhaust stack or stacks that reduces the quantity of a pollutant that is emitted to the air. The device may destroy or secure the pollutant for subsequent recovery. Examples are incinerators, condensers, carbon adsorbers, and biofiltration units. Transfer equipment and ductwork are not considered in and of themselves add-on air pollution control devices.
Source
40 CFR § 63.702
Scoping language
All terms used in this subpart that are not defined below have the meaning given to them in the Clean Air Act and in subpart A of this part.