Artikel 67

(1) Doors shall have resistance to fire as far as practicable, equivalent to the division in which they are fitted. Doors and door frames in “A” Class divisions shall be constructed of steel. Doors in “B” Class divisions shall be non-combustible. Doors fitted in boundary bulkheads of machinery spaces of Category A shall be self-closing and reasonably gastight. The Administration may permit the use of combustible materials in doors separating cabins from the individual interior sanitary accommodation, such as showers, if constructed according to Method IF.
(2) Doors required to be self-closing shall not be fitted with holdback hooks. However, hold-back arrangements fitted with remote release fittings of the fail-safe type may be used.
(3) Ventilation openings may be permitted in and under the doors in corridor bulkheads except that such openings shall not be permitted in and under stairway enclosure doors. The openings shall be provided only in the lower half of a door. Where such opening is in or under a door the total net area of any such opening or openings shall not exceed 0.05 square metres. When such opening is cut in a door it shall be fitted with a grille made of non-combustible material.
(4) Watertight doors need not be insulated.