---
kind: "section"
citation: "46 C.F.R. § 108.185"
title: "46"
number: "108.185"
heading: "Ventilation for enclosed classified locations."
url: "https://uscodex.org/cfr/46/108.185"
---

# §108.185. Ventilation for enclosed classified locations.

- (a) The ventilation system for each enclosed classified location must be designed to maintain a pressure differential between the enclosed classified location and each non-classified location adjacent to the enclosed classified location, so as to prevent the discharge of ignitable gases into the non-classified adjacent locations.
- (b) Each air intake must be outside of enclosed classified locations.
- (c) Each unit must have alarms that are powered independently of the ventilation motor power and control circuitry and sound at a continuously manned station when—
  - (1) Gas is present in an enclosed classified location; or
  - (2) **The ventilation system for the space is not working.**
- (d) Each ventilation system for enclosed classified locations must provide a complete change of air every five minutes.

## Notes

### Amendments

[CGD 73-251, 43 FR 56808, Dec. 4, 1978, as amended by CGD 94-108, 61 FR 28270, June 4, 1996]

### Authority

Authority: 43 U.S.C. 1333; 46 U.S.C. 3102, 3306; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGD 73-251, 43 FR 56808, Dec. 4, 1978, unless otherwise noted.

### Amendments

[CGD 73-251, 43 FR 56808, Dec. 4, 1978, as amended by CGD 94-108, 61 FR 28270, June 4, 1996]