Section 27(5) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(5)If the means of entry into water closets forming part of the crew accommodation is from a passageway leading to other parts of the crew accommodation, a lobby shall be provided at the entrance of the water closet, or where a lobby is not practicable a self closing door between a water closet and a passageway shall be close fitting and without apertures. The Central Government may exempt any ship from the requirement that the doors shall be close fitting and without apertures to the extent that it is satisfied that the exhaust ventilation arrangements from the water closet render compliance therewith unnecessary.
