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Open flames that use combustion air from the machinery room shall not be installed in a machinery room, when said machinery room is required by Section 18-28-1104.2.
Exceptions:
1. Matches, lighters, halide leak detectors and similar devices.
2. Where the refrigerant is carbon dioxide or water.
3. Fuel-burning appliances shall not be prohibited in the same machinery room with refrigerant- containing equipment or appliances where combustion air is ducted from outside the machinery room and sealed in such a manner as to prevent any refrigerant leakage from entering the combustion chamber.