15.16.070 Warm air-Preparation of furnaces-Installation of conversion gas burners.
   A.   Preparation of Furnaces.
      1.   Cast iron furnace or other furnaces must be completely torn down, castings cleaned inside and out, warm and cold air ducts thoroughly cleaned; castings recemented and built back up before burner is installed.
      2.   It is very necessary that all traces of carbon which were caused by the combustion of coal or oil be removed as carbon in an insulator.
      3.   All flues not having cleanout door at bottom shall be equipped with same, if possible, and flue must be thoroughly cleaned before installation is completed.
      4.   Furnaces must be carefully inspected for cracked or burned sections and where such sections are found to be defective, new sections must be installed before furnace is assembled and burner installed. Under no condition shall cracked sections,which have been cemented, be installed.
   B.   Installation of Conversion Gas Burners.
      1.   Upshot burner shall be installed approximately two inches above grate level in all types of installation, making sure same is absolutely level. Ash pit opening and feed door slide shall be sealed with a combination of asbestos and cement or a metal plate, fitted to seal out excess air.
      2.   Supply line shall be connected with a tee, with nipple extending to floor, and cap on nipple. This will support line and burner, also trap dirt, etc. Union to be installed between valve and burner. All warm air heating plants shall have Airstat properly wired to prevent overheating.
      3.   All fire feed doors shall be made fast with spring-type closer. Positive latch shall not be used. All furnaces must be equipped with metal stack, or its equivalent, and downdraft diverter.
      4.   Where inshot burner is installed, installation must conform to manufacturer's instructions and such instructions supplied to the inspector for checking at time of inspection.
(Prior code § 14.301(g)).