46 CFR § 108.175 - Contiguous locations.
---
identifier: "/us/cfr/t46/s108.175"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 108.175 - Contiguous locations."
title_number: 46
title_name: "Shipping"
section_number: "108.175"
section_name: "Contiguous locations."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "I-A"
subchapter_name: "A—MOBILE OFFSHORE DRILLING UNITS"
part_number: "108"
part_name: "DESIGN AND EQUIPMENT"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "43 U.S.C. 1333; 46 U.S.C. 3102, 3306; DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGD 73-251, 43 FR 56808, Dec. 4, 1978, unless otherwise noted."
cfr_part: "108"
---
# 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.