‘C’ class divisions are constructed of approved incombustible materials but
do not need to meet with any specified requirements relative to passage of
smoke and flame nor temperature rise.
The standard fire test referred to is a test in which a specimen of the division
with a surface area of not less than 4.65sq.m and height or length of
2.44 m is exposed in a test furnace to a series of time-temperature relationships,
defined by a smooth curve drawn through the following points.
Some typical examples of fire divisions are given below for a passenger ship
carrying more than thirty-six passengers.
Openings in Fire Protection Divisions
Generally openings in fire divisions are to be fitted with permanently
attached means of closing which have the same fire resisting rating as the
division. Suitable arrangements are made to ensure that the fire resistance
of a division is not impaired where it is pierced for the passage of pipes,
vent trunks, electrical cables, etc.