General
30.—(1)  All ventilation shall be arranged to the satisfaction of the Port Health Officer and a surveyor of ships.
(2)  Where a system of cowl ventilation is provided the cowls shall be placed in such positions that the ventilating shafts can be kept open in ordinary weather, and they shall be arranged, as far as practicable, to give a down draught at one end of the compartment and an up draught at the other.
(3)  Each compartment shall be ventilated independently of any other compartment, and holds shall be ventilated in such a manner as not to open into, or affect in any way, the passenger compartments.
(4)  If it is proposed to adopt a mechanical system of ventilation or any new system of ventilation, full details of the arrangements, with drawings, shall be submitted to the Surveyor‑General of Ships for consideration and approval.
(5)  Trunkways built solely for ventilation and carried to such a height above the weather deck that it will not be necessary to close them under any circumstances, may be accepted as either air inlets or outlets, but not as both, to compartments otherwise ventilated artificially or by cowls; but when a trunkway is thus used in combination with cowl ventilators, its area shall be at least double that of a cowl ventilator doing similar duty.
(6)  All hospitals shall be ventilated independently and to the open air; the ventilators shall have at least 5 square inches of inlet and 5 square inches of outlet area per adult, with means for controlling the size of these openings.
(7)  All sanitary arrangements shall be suitably and efficiently ventilated to the open air.
(8)  No ventilator may be carried through any transverse watertight bulkhead without the consent of the Surveyor-General of Ships.