---
kind: "section"
citation: "46 C.F.R. § 108.175"
title: "46"
number: "108.175"
heading: "Contiguous locations."
url: "https://uscodex.org/cfr/46/108.175"
---

# §108.175. Contiguous locations.


An enclosed space that has direct access to a Division 1 or Division 2 location is the same division as that location, except—

- (a) **An enclosed space that has direct access to a Division 1 location is not a hazardous location if—**
  - (1) The access has self-closing gas-tight doors that form an air lock;
  - (2) The ventilation causes greater pressure in the space than in the Division 1 location; and
  - (3) Loss of ventilation overpressure activates an alarm at a manned station;
- (b) An enclosed space that has direct access to a Division 1 location can be considered as a Division 2 location if—
  - (1) The access has a self-closing, gas-tight door that opens into the space and that has no hold-back device;
  - (2) Ventilation causes the air to flow with the door open from the space into the Division 1 location; and
  - (3) Loss of ventilation activates an alarm at a manned control station; and
- (c) **An enclosed space that has direct access to a Division 2 location is not a hazardous location if—**
  - (1) The access has a self-closing, gas-tight door that opens into the space and that has no hold-back device;
  - (2) Ventilation causes the air to flow with the door open from the space into the Division 2 location; and
  - (3) **Loss of ventilation activates an alarm at a manned control station.**

## 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.