1 Cargoes liable to give off vapours or gases
which can form an explosive mixture with air (see the BC Code, Appendix
B, e.g. IMO Class 4.3 materials):
Two separate fans should be permanently fitted or being of a
portable type adapted for being permanently fitted prior to loading
and during voyage. The fans should be either explosion proof or arranged
such that the escaping gas flow is separated from electrical cables
and components. The total ventilation should be at least six air changes
per hour, based upon the empty space. Ventilation should be such that
any escaping gases cannot reach living spaces on or under deck.
2 Cargoes liable to spontaneous combustion (only
applicable to Seed Cake (b) and (c)):
Two separate fans should be permanently fitted or being of a
portable type adapted for being permanently fitted prior to loading
and during voyage. The fans should be either explosion proof or arranged
such that the escaping gas flow is separated from electrical cables
and components. The total ventilation should be at least six air changes
per hour, based upon the empty space. Ventilation should be such that
any escaping gases cannot reach living spaces on or under deck.
3 For open-top container ships:
Power ventilation should be required only for the lower part
of the cargo hold for which purpose ducting is required. The ventilation
capacity should be at least two air changes per hour based on the
empty hold volume below weather deck.