(1) In rooms with or without windows, used for the keeping or storage of motor vehicles which may be operated under their own power within such rooms, and which rooms are not used for service, repair or maintenance, the provisions of this section shall be observed.

(2) Rooms with floors not lower than the average adjoining finished ground-level shall be ventilated as follows—

a) In naturally ventilated rooms, when the area of floor of the room is within the range set out in column 1 of Table III, the area of permanent ventilation-openings in the room shall be not less than the area set out in column 2 of that Table;

b) The value of the area of such permanent ventilation-openings may be read off from the curve in Figure 1;

c) In mechanically ventilated rooms, when the area of the floor of the room is within the range set out in column 1 of Table III, the volume of air in cubic meters per minute, which must be extracted from the room, shall be not less than the volume set out in column 3 of that Table;

d) The value of such volume may be read off from the curve in Figure 2;

e) At least half the quantity of air referred to in paragraph © shall be extracted from within a height of 600 millimeters above the floor;

f) Rooms with floors lower than the average adjoining finished ground-level shall be mechanically ventilated, as required in paragraphs (c), (d) and (e);

g) Garage-pits and wells within garages shall have at least 0,3 cubic meter of air per minute per square meter of floor area of the pit or well, extracted by mechanical ventilation, and such air shall be extracted from openings positioned within 300 millimeters of the bottom of the pit or well.

Table III