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:
(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.