11 Heat exchangers, other than parts of machines; pyrolysis furnaces; heating furnaces for industrial purposes; industrial furnaces; nuclear reactors; shaped fittings for furnaces; hearths; coolers for furnaces; kiln furniture [supports]; structural framework for ovens; kilns; freezers for industrial purposes; waste water treatment tanks; septic tanks; garbage incinerators; water purifying apparatus; drying apparatus for chemical processing; recuperators for chemical processing; steamers for chemical processing; evaporators for chemical processing; distillers for chemical processing; solar water heaters; radiators for industrial air-conditioning purposes; air-conditioning apparatus; air-conditioning installations; coils as parts of distilling, heating or cooling installations; boiler pipes for heating installations; pipes for heating boilers.