21. Portable apparatus holding not more than 1 kilo. of carbide and of
not more than 50 litres per hour productive capacity, and apparatus fixed
and used out of doors are exempt from the foregoing regulations except
Nos. 11 and 12, and the first part of 13.
In regard to (_b_), plant houses, it is enacted that:
1. Rooms containing acetylene apparatus must be of ample size, used for
no other purpose, have water-tight floors, be warmed without fireplaces
or chimneys, be lighted from outside through an air-tight window by an
independent artificial light, have doors opening outwards, efficient
ventilation and a store of sand or like material for fire extinction.
Strangers must be warned away.
2. Apparatus of not more than 300 litres per hour productive capacity may
be erected in basements or annexes of dwelling houses, but if of over 50
litres per hour capacity must not be placed under rooms regularly
frequented. Rooms regularly frequented and those under the same must not
be used.
3. Apparatus of more than 300 litres per hour productive capacity must be
erected in an independent building at least 15 feet distant from other
property, which building, unless it is at least 30 feet distant, must be
of fire-proof material externally.
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