[F112 Details of construction (R 35) U.K.
NEW CLASS B, C AND D AND EXISTING CLASS B SHIPS: U.K.
In accommodation and service spaces, control stations, corridors and stairways:
.1
air spaces enclosed behind ceilings, panelling or linings shall be suitably divided by close-fitting draught stops not more than 14 metres apart;
.2
in the vertical direction, such enclosed air spaces, including those behind linings of stairways, trunks, etc. shall be closed at each deck.]