Special category s

I.2.1.1.2 Special category spaces are to be equipped with forced ventilation capable of effecting at least
10 air changes per hour. Special category spaces are closed vehicle decks on passenger ships to which
the passengers have access.
I.2.1.1.3 During loading and unloading periods an increased air change rate of 20 air changes per hour
is to be provided 8.
I.2.1.2 Performance and design of ventilation systems
I.2.1.2.1 In passenger ships, the power ventilation system of the space shall be separate from other
ventilation systems and shall be in operation at all times when vehicles are in such spaces. Ventilation
ducts serving such cargo spaces capable of being effectively sealed shall be separated for each such
space. The system shall be capable of being controlled from a position outside such spaces.
I.2.1.2.2 On passenger ships, a fan failure (monitoring of motor fan switching devices is sufficient) or
failure related to the number of air changes specified for vehicle decks and holds shall be alarmed on the
bridge.
I.2.1.3 Closing appliances and ducts
Ventilation ducts, including dampers shall be made of steel. In passenger ships, ventilation ducts that
pass through other horizontal zones or machinery spaces shall be "A-60" class steel ducts constructed in
accordance with D.5.3.