---
kind: "section"
citation: "40 C.F.R. § 65.118"
title: "40"
number: "65.118"
heading: "Alternative means of emission limitation: Enclosed-vented process units."
url: "https://uscodex.org/cfr/40/65.118"
---

# §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](/cfr/40/65.115.md) are exempt from the requirements of [§§ 65.106 through 65.114](/cfr/40/65.106..65.114.md) and [§ 65.116](/cfr/40/65.116.md). 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.

## Notes

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 65 FR 78285, Dec. 14, 2000, unless otherwise noted.