1969-HKRS30-8-59_Part07 — Page 39

Ventilation,

bertbed passenger Recommoda- tion.

Ventilation,

unberthed

passenger accommoda- tion.

18

(b) where any stairway from between decks is led into a compartment in a deckbouse on the weather deck, the aggregate width of the openings from the compartment to the exposed deck shall be not less than the width required for the stairway, with the addition thereto of not less than 2 inches for every 5 persons accommodated in the compartment.

(2) Where a doorway serves exclusively a superstructure or deckhouse the aggregate of the clear opening shall be not less than 2 inches for every 5 persons accommodated therein, and shall be not less than 30 inches in width.

(3) For the purpose of this regulation, "clear opening" means, in respect of stairways or doors, the least width of the space at the opening between its sides or between handrails. if they are fitted to the stairway or door.

21. (1) In every ship to which these regulations apply the ventilation to every space or compartment allocated for the accommodation of berthed passengers shall be provided by-

(a) a trunked mechanical ventilation or other air change system approved by the Director which will maintain the air therein in a state of purity adequate for the health and comfort of the passengers; or

(b) a natural ventilation system so designed as to provide an aggregate area of not less than 6 square inches each of inlet and of exhaust for each person for whom the space is appropriated and shall be not less than 19 square inches in all at any point in the system; and the effective area of the inlet and of the exhaust shall be capable of being adjusted from fully open down to a minimum of 3 square inches for each such person.

(2) In every ship other than a ship provided with a trunked mechanical ventilation or other air change system, every berthed passenger space other than sanitary accommodation shall be fitted with an electric fan.

22. (1) In every ship to which these regulations apply engaged in the eastern trade area or the river trade area, every space or compartment allocated for the accommodation of un- berthed passengers shall be fitted with a ventilation system in accordance with this regulation or with regulation 23, so arranged

us to ensure—

(a) the maximum distribution of fresh air throughout the

accommodation;

19

(b) that the ventilation of each unberthed passenger compart-

ment shall be independent of that of all other compart ments; and

(c) that no inlet ventilator is either screened from the wind in any direction or situated directly over a doorway. stairway or exhaust opening.

(2) Any ventilation system required to be fitted pursuant to this regulation shall be fitted notwithstanding the provision of any side scuttle, door, hatchway, skylight or other aperture in any unberthed passenger accommodation not provided solely for ventilation purposes.

(3) No ventilator shall be trunked through any watertight sub-division bulkhead; and every ventilator shall be fitted with suitable protection against the risk of fire.

(4) Any ventilator shaft constructed solely for the purposes of ventilation may be fitted as an air outlet when serving a compartment ventilated either naturally or mechanically if its coaming extends sufficiently high above the weather as to permit the ventilator to remain open in ordinary weather:

Provided that where a non-cowl type of ventilator is fitted in a natural ventilation system as an exhaust ventilator its area shall be at least double that required for a cowl ventilator in the same position.

(5) Any unberthed passenger space situated in the uppermost between deck, bridge or other detached superstructure compart- ment or deckhouse shall be ventilated by

(a) a trunked mechanical ventilation or other air change

system fitted in accordance with regulation 23; or

(b) a natural ventilation system so arranged as to provide an aggregate area of not less than 10 square inches for each person of the maximum number for which the space may be measured, that is 5 square inches each of inlet and of exhaust ventilation:

Provided that where a compartment is abreast the machinery or boiler casings, or immediately above the machinery spaces, the area of each ventilator serving the compartment shall be increased by not less than 50 per

centum.

(6) Every ventilator cowl shall-

(a) be placed in an unobstructed position where it can remain open in ordinary weather and can be trimmed in any direction; and