598
THE HONG KONG GOVERNMENT GAZETTE, AUGUST 3, 1934
Positions of inlets, etc.
Ducts and shafts.
Position of inlets, etc., in relation to stage.
Ventilation
of lavatories, etc.
Valves and dampers.
Access to fans, etc.
-Short
circuiting of air supply.
Interlocking of fans.
Incom- bustible material.
Continuous
use.
Working.
Ventilating shafts.
Mainten-
ance.
109. The inlet and extract gratings, openings, ducts and fans shall be so placed, and of such size, that no objectionable draughts are caused.
110. When air ducts and shafts are constructed of material other than metal they shall be formed of, or lined with, a suitable smooth material impervious to moisture. All ducts shall have adequate means of access for cleaning pur-
poses.
111. In any premises at which a safety curtain is pro- vided to the proscenium opening, the installation shall be such that under any conditions of working it shall not be possible for a current of air to be drawn from the stage to the auditor- ium, and, in order to ensure this, supplementary mechanical means of extracting air from the stage shall be provided if required by the Building Authority and the Licensing Authority.
112. Independent means of extraction from lavatories and sanitary conveniences shall be provided and so arranged that the air movements shall not be from the lavatories and conveniences into other parts of the premises.
113. All regulating valves and dampers necessary to secure effective air distribution shall be fitted with pointers or other means of indicating the positions in which they are set and with an approved locking device which cannot be readily interfered with by the public.
114. When practicable means of access to all fans, motors, control gear and other apparatus shall be provided and the starting mechanism shall be adjacent to or in sight of the machinery which it controls.
115. If two or more extraction fans are installed provi- sion shall be made, if required by the Building Authority and the Licencing Authority to ensure that the operation of the fans shall not be ineffective in the event of one or more of the fans being out of use.
116. If fans are provided both for the supply and ex- traction of air, and the use of the extract fans alone is found to cause discomfort, the motors shall, if required by the Build- ing Authority and the Licensing Authority be interlocked so as to prevent any of the extract fans being run when the inlet fans are not working.
117. The materials used for the ventilation and cooling equipment shall be incombustible so far as may be reasonably possible.
118. The means of ventilation shall be used continuously during the whole of the time that the public are on the premises so as to provide efficient ventilation.
119. Detailed instructions relative to the working of the ventilation system shall be exhibited in such positions as the Licensing Authority may require.
120. The ventilating shafts shall be kept in a clean condition.
121. The installation shall be constantly under the supervision of a competent person,
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