Section 59.81. Hazardous areas

(a) Boiler or furnace rooms, repair or maintenance rooms, trash rooms, and rooms or spaces used for the storage of combustible materials in quantities deemed hazardous by the Department shall be separated from other areas of the building by 1-hour partitions, floors, and ceilings. Openings shall be protected by C label door assemblies.

(b) American Gas Association approved gas fired forced air furnaces and space heaters; U.L. approved electrical resistive coil heating furnaces and U.L. approved oil fired forced air furnaces and space heaters need not be enclosed.

(c) In rooms and spaces within buildings of group D-H occupancy, involving explosion hazards, venting areas shall be provided to afford not less than 1 square foot of relief area to 50 cubic feet of room volume. Venting may be provided by wall areas of light noncombustible materials, top-hinged windows or panels or other pressure relieving devices arranged to open outward under predetermined pressure.

(d) Approved paint spray booths which are either equipped with an adequate exhaust system, to be operated before paint may be applied and continued in operation until the paint is dry, or which are equipped with an approved water paint vehicle recirculating system shall not be considered D-H occupancies.