Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 55 - DIVISION C-2 HOTELS, MOTELS, APARTMENT BUILDINGS, ETC
SPECIAL CONDITIONS
Section 55.81 - 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 C label door assemblies. Combustion and ventilation air for boiler, incinerator or heater rooms shall be taken directly from and discharged directly to the outside air.

(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.