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18-28-701.5  Prohibited sources.
   Openings and ducts shall not connect appliance enclosures with a space in which the operation of a fan will adversely affect the flow of combustion air. Combustion air shall not be obtained from a hazardous location, except where the fuel-fired appliances are located within the hazardous location and are installed in accordance with the building code. Combustion air shall not be taken from a refrigeration machinery room.