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18-28-1004.5  Floors.
   Boilers shall be mounted on noncombustible floors with noncombustible flooring and surface finish and with no combustible material against the underside thereof; or, on fire resistance slabs or arches having no combustible materials against the underside there of unless the boiler is specifically listed for installation on a combustible floor or the floor is protected in an approved manner and the installation is approved by a registered professional engineer.