(1) Non-habitable rooms used mainly as a means of access, such as corridors, stairways and the like, shall have a clear height of not less than 2,3 meters throughout, and all other non-habitable rooms shall have a clear height of not less than 2,1 meters over at least 80 per centum of the floor area.

(2) Rooms containing soil-water fittings shall comply with the following requirements—

a) The minimum internal floor dimensions of a room containing a water-closet shall be 750 millimeters × 1,4 meters;

b) Every room ventilated by natural ventilation and containing one or more than one soil water fitting (every 500-millimetre length of urinal-stall shall be considered the equivalent of one soil-water fitting) shall be provided with adequate means of permanent ventilation-opening of at least 0,2 square meter for each such fitting;

c) The ventilation-opening shall open –

i) To the open air; or

ii) Into a natural ventilation-shaft with a cross-sectional area of at least 1,5 square meters and with a minimum lateral dimension of 900 millimeters; or

iii) Into a natural ventilation-duct of equal dimensions taken to an approved discharge-point;

d) Where such rooms are ventilated by mechanical ventilation, at least 0,75 cubic meter of air per minute per square meter of floor area of the room shall be extracted by the ventilation system;

e) Every room containing one or more than one soil-water fitting shall be so constructed that such room leads either—

i) Directly into the open air; or

ii) Into a lobby or passage ventilated in accordance with the provisions of sub-section (4) of section 6; or

iii) Into a bedroom in a dwelling or an hotel.

(3) Bath-rooms shall be ventilated as required for habitable rooms in sections 5, 6 and 7.

(4) Shower-cubicles shall comply with the requirements of subsection (2), unless such shower-cubicle is contained in a bath-room of a dwelling or hotel suite.