40 CFR § 65.118 - Alternative means of emission limitation: Enclosed-vented process units.
---
identifier: "/us/cfr/t40/s65.118"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 65.118 - Alternative means of emission limitation: Enclosed-vented process units."
title_number: 40
title_name: "Protection of Environment"
section_number: "65.118"
section_name: "Alternative means of emission limitation: Enclosed-vented process units."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "65"
part_name: "CONSOLIDATED FEDERAL AIR RULE"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "65 FR 78285, Dec. 14, 2000, unless otherwise noted."
cfr_part: "65"
---
# 65.118 Alternative means of emission limitation: Enclosed-vented process units.
(a) *Use of closed vent system and control device.* Process units that are enclosed in such a manner that all emissions from equipment leaks are routed to a process or fuel gas system or collected and vented through a closed vent system to a control device meeting the requirements of § 65.115 are exempt from the requirements of §§ 65.106 through 65.114 and § 65.116. 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.
(b) *Recordkeeping.* Owners and operators choosing to comply with the requirements of this section shall maintain the following records:
(1) Identification of the process unit(s) and the regulated materials they handle.
(2) A schematic of the process unit, enclosure, and closed vent system.
(3) A description of the system used to create a negative pressure in the enclosure to ensure that all emissions are routed to the control device.