Control technique means any equipment or process control used for capturing, recovering, treating, or preventing HAP emissions. The equipment includes recovery devices and non-recovery control devices, as defined in this paragraph. The process control includes cellulose ether process changes and viscose process changes, as defined in this paragraph.
40 CFR § 63.5610
For all affected sources complying with the batch process vent testing provisions in 63.490(c) and the operating limit provisions in 63.505(c), the terms used in this subpart and in subpart U of this part are defined in 63.482 and paragraph (g) of this section.