When examining the ventilation in a ro-ro cargo space, options
that are available should be borne in mind. It is by no means certain
that the greatest effect will be achieved with all the fans operating
at maximum speed at the same time or with all doors, hatches and the
like open. This may have the opposite effect. In some circumstances,
when the wind direction and strength are favourable, the opening of
suitable doors may provide effective natural ventilation.