Air conditioning plants, air-conditioning, air cooling and ventilation apparatus and instruments, energy regeneration plants and parts of the aforementioned goods, included in this class, namely, ventilation hoods; regenerative and recuperative energy regeneration plants; air humidifiers for air conditioning plants, air heaters, air filters for air conditioning, air filtering plants, air cooling devices, namely, evaporative air coolers, air purifying appliances and machines, air driers in the...