Air conditioners; air purifiers; humidifiers; dehumidifiers; ventilating apparatus, namely, ventilating fans for household purposes; ventilating installations, namely, ventilating fans for industrial purposes; air cooling apparatus; hot-air space heating apparatus; air heating installations; water heaters; hot water heaters; heat pumps; fans for air conditioning apparatus; heat exchangers, other than parts of machines, for air conditioning; heat exchangers, other than parts of machines, for v...