12.2.1 Enclosed spaces where cargo vapours may
accumulate shall be capable of being ventilated to ensure a safe environment
when entry into them is necessary. This shall be capable of being
achieved without the need for prior entry.
12.2.2 For permanent installations, the capacity
of 8 air changes per hour shall be provided and for portable systems,
the capacity of 16 air changes per hour.
12.2.3 Fans or blowers shall be clear of personnel
access openings, and shall comply with 12.1.7.