11 Air purifying machines, namely, air purifying machines for recovering carbon dioxide discharged from calcining kilns and rotary kilns; air purifying units, namely, machines for removing harmful substances discharged from calcining kilns and rotary kilns; drying apparatus for chemical processing; recuperators for chemical processing; steamers for chemical processing; evaporators for chemical processing; distillers for chemical processing; heat exchangers for chemical processing; gas condensers, other than parts of machines; gas purification apparatus; sintering furnaces; incinerators; calcining kilns for industrial purposes; rotary kilns; furnaces for industrial purposes; nuclear reactors; gas burners; boilers, other than parts of non-electric prime movers or engines, namely, electric boilers; hydrants; faucets; water, fluid level controlling valves for tanks; anti-splash tap nozzles; waste water treatment tanks for industrial purposes; garbage incinerators; structural framework sold as parts of furnaces; kiln furniture; fans for air-conditioning installations; regulating accessories for water or gas apparatus and pipes, namely, metered valves; bioreactors for use in the treatment of waste; scrubbers for gas installations; filtration type dust collector for air purification; filtration type dust collector for gas purification; hot-air furnaces for industrial purposes, namely, air heating furnaces for industrial purposes