Class B.--Stationary Non-Automatic Apparatus.
10. FOUNDATIONS.--(a) Must be of brick, stone or concrete.
(b) Must be so arranged that the machine will be level and so that strain will not be brought upon the connexions.
11. GAS-HOUSES.--(a) Must be constructed entirely of non- combustible material and must not be lighted by any system of illumination involving open flames.
(b) Must be heated, where artificial heating is necessary to prevent freezing, by steam or hot-water systems, the heater to be located in a separate building, and no open flames to be permitted within generator enclosures.
(c) Must be kept closed and locked excepting during daylight hours.
(d) Must be provided with a permanent and effective system of ventilation which will be operative at all times, regardless of the periods of operation of the plant.
12. ESCAPE-PIPES.--Each generator must be provided with a vent-pipe of ample size, substantially installed, without traps. It must be carried to a suitable point outside the building and terminate in an approved hood located at least 12 feet above ground and remote from windows.
The hood must be constructed in such a manner that it cannot be obstructed by rain, snow, ice, insects or birds.
13. CARE AND MAINTENANCE.--All charging and cleaning of apparatus, generation of gas and execution of repairs must be done during daylight hours only, and generators must not be manipulated or in any way tampered with in the presence of artificial light.