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4. The ceiling shall be even, impermeable to damp and
dust, and durable.
5. Every underground bakehouse shall be approached by
a suitable staircase adequately lighted and ventilated. No
outside staircase shall terminate within an underground bakehouse.
Any opening into the shop above must be covered to
prevent the entrance of dust.
B.—Light.
6. The underground bakehouse shall be adequately
lighted with daylight throughout, to the satisfaction of the
Sanitary Authority, and the lighting maintained shall be such
that an Official Copy of the Abstract of the Factory Act may
ordinarily be read in all parts of such bakehouse between the
hours of 11 a.m. and 3 p.m.
C.—Ventilation.
7. Ventilation shall be so arranged that the circulation
of air is confined to the underground bakehouse.
8. 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 purposes of combustion, in such a manner as to avoid the
occurrence of draught, and so that the air is sufficiently renewed
in all parts of the underground bakehouse ; and by the
aid of mechanical power, where, in the opinion of th° Medical
Officerof Health, such is necessary.
Provision shall be made for the removal of steam.
Where mechanical power is used, the fiesh 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.
9. Arrangements for ventilation shall be such that the
temperature of the underground bakehouse from October 1st
to May 31st shall not exceed 8o° Fahr., except within half-nnhour
after a batch of bread has been drawn.