6.3.1 In a sailing vessel the area of freeing
ports should be at least 10% of that part of the bulwark area which
extends for 2/3 of the vessel's length amidships. A freeing port should
be located in the lower third of the bulwark height, as close to the
deck as practicable. A freeing port should be fitted with a grid which
has a spacing of not more than 50mm in any direction.
6.3.2 Where the average height of the bulwark
over its length does not exceed 150mm, freeing ports will not be required,
however attention should be paid to suitable drainage arrangements.