46 C.F.R. § 108.455 Enclosure openings.
Title 46 - Shipping
(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.
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PART 108—DESIGN AND EQUIPMENT
Subpart D—Fire Extinguishing Systems
Fixed Carbon Dioxide Fire Extinguishing Systems
§ 108.455 Enclosure openings.
