View report page

73
confined to the underground bakehouse. An underground bakehouse
shall be properly and effectually ventilated to the satisfaction
of the Sanitary Authority by permanent inlets and outlets (other
than the windows or staircase) of sufficient size and suitable character,
communicating directly with the open air, but in such a way and at
such a height above the street level (or ground adjoining) as to
prevent as far as possible the entrance into the underground bakehouse
of all street or other dust and dirt; the inlet and outlets to be
of proper prescribed sizes, and, further, such openings shall not be
under the control of the persons employed, and one of the outlets
shall be situated in the ceiling over the oven door, if possible, so as
to ensure ready extraction of foul air by the heat, the others at such
a height as to deliver the air upwards without draughts so as to
ensure a constant and equable temperature, say 60 degrees to 65
degrees Fahr., except within half an hour after a batch of bread has
been drawn. The standard of ventilation should be such that the
carbonic acid gas does not exceed 10 per 10,000 volumes while the
work is going on.
Note —Ventilation shall be adequate, that is to say, fresh clean
air shall be supplied constantly during working hours, so as to
provide not less than 3,000 cubic feet of air per hour for each
person employed, with any additional amount required for the
purposes of combustion, in such a manner as to avoid the
occurrence of draughts, and so that the air is sufficiently
renewed in all parts of the underground bakehouse.
When natural ventilation is not effective or insufficient, ventilation
by fans or other artificial means shall be provided so as to
produce the above described result.
Note.—Where mechanical power is used, the fresh air shall be
taken from a height above the level of the adjoining ground of
not less than 6 feet and be distributed to different parts of the
underground bakehouse in such a manner as to change the air
of such bakehouse in all parts.