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Heating, ventilating and air-conditioning apparatus and installations built thereof as well as their essential characteristic parts, namely, air distributors, ventilators, exhaust fans and ventilating fans, hot air blowers, coil heaters, air coolers, gas condensers, air conditioners, heat accumulators, heat recuperators, heat exchangers, pipes for conducting exhaust air and ventilating, air valves, namely, ventilating flaps, and air diffusers; heat pumps, solar collectors, solar accumulators, * all the aforementioned goods excluding components, installations and parts made of malleable iron and cast iron *