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(2) The walls shall be made, and kept at all times, smooth
and impervious throughout, so that the underground bakehouse
is free from damp.
(3) The ceilings shall be properly ceiled, and kept at all times
impervious to dust, or, if made of brick, rendered smooth.
(4) The floors shall be made with at least 6in. concrete,
rendered smooth in cement, or with other jointless, or
impervious paving throughout, so that the underground
bakehouse is free from damp.
(5) Any drain or sewer under the bakehouse shall be constructed
of gas and water-tight pipes. No gully shall be within the
bakehouse, unless the pipe connected therewith be made to
discharge over a trapped inlet outside the bakehouse.
(6) Provision shall be made for safe and suitable means of
access to the bakehouse.
B.—Light.
(7) The underground bakehouse shall be provided with one or
more windows, opening directly into the external air above
the ground level, or into an area or areas directly communicating
with the external air and not glazed over, so as to
be properly lighted by the admission of daylight—such
window or windows shall have a total superficies, clear of
the sash frames equal to at least one-twelfth of the floor
space of the underground bakehouse, and shall be so
constructed as to exclude the entrance of street dust, and
wherever artificial light is used such light shall be if
practicable, electric light.
C.— Ventilation.
(8) The underground bakehouse shall be properly and effectually
ventilated by permanent inlets and outlets (other than the
window or windows), communicating directly with the open
air, but in such a way, and at such a height above the
street level, as to prevent, as far [as possible, the entrance
into the underground bakehouse of street dust and dirt;
the inlets and outlets shall be of proper prescribed sizes;
and, further, such openings shall not be under the control
of the persons employed. One of the openings shall be
situated in the ceiling and the other at such a height as
to deliver the air upwards without draughts, so as to ensure