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Code of Federal Regulations (Last Updated: April 5, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter C - Air Programs |
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Part 63 - National Emission Standards for Hazardous Air Pollutants for Source Categories |
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Subpart H - National Emission Standards for Organic Hazardous Air Pollutants for Equipment Leaks |
§ 63.179 - Alternative means of emission limitation: Enclosed-vented process units.
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§ 63.179 Alternative means of emission limitation: Enclosed-vented process units.
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 device.