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18-28-918.9.4  Assembly and installation.
   A central heating furnace shall be installed in accordance with the manufacturer's instructions and shall be installed on a floor of noncombustible construction with noncombustible flooring and surface finish and with no combustible material against the underside thereof, or on fire-resistive slabs or arches having no combustible material against the underside thereof.
   Exceptions:
      1.   Appliances listed for installation on a combustible floor.
      2.   Installation on a floor protected in an approved manner.