Gas utilization equipment installed in repair garages shall be installed in a detached building or room, separated from repair areas by walls or partitions, floors, or floor ceiling assemblies that are constructed so as to prohibit the transmission of vapors and having a fire resistance rating of not less than 1 hour and that have no openings in the wall separating the repair area within 8 feet (2.4 m) of the floor. Wall penetrations shall be firestopped. Air for combustion purposes shall be obtained from outside the building. The heating room shall not be used for the storage of combustible materials.
Exceptions:
1. Overhead heaters where installed not less than 8 feet (2.4 m) above the floor shall be permitted.
2. Heating equipment for vehicle repair areas where there is no dispensing or transferring of Class I or Class H flammable or combustible liquids or liquefied petroleum gas shall be installed in accordance with NFPA 30A, Automotive and Marine Service Station Code.