---
kind: "section"
citation: "46 C.F.R. § 108.455"
title: "46"
number: "108.455"
heading: "Enclosure openings."
url: "https://uscodex.org/cfr/46/108.455"
---

# §108.455. Enclosure openings.

- (a) Mechanical ventilation for spaces protected by a CO2 system must be designed to shut down automatically when the system is activated.
- (b) Each space that is protected by a CO2 system and that has natural ventilation must have a means for closing that ventilation.
- (c) Each space protected by a CO2 system must have the following means for closing the openings to the space from outside the space:
  - (1) **Doors, shutters, or dampers for closing each opening in the lower portion of the space.**
  - (2) Doors, shutters, dampers or temporary means such as canvas or other material normally on board a unit may be used for closing each opening in the upper portion of the space.

## Notes

### 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.