Process units enclosed in such a manner that all emissions from equipment leaks are
vented through a closed-vent system to a control device meeting the requirements of
§ 63.172 of this subpart are exempt from the requirements of § 63.163, through 63.171, and §§ 63.173 and 63.174 of this subpart. The enclosure shall be maintained under a negative pressure at all times while the
process unit is in operation to ensure that all emissions are routed to a control
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