Heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which hot, cold or low temperature water circulates; industrial dryers for heating and dehumidifying; [ industrial dryers for household or housework use for heating and dehumidifying; ventilating fans for residential, commercial, industrial and public buildings; steel and ] cast-iron tubular radiators; electric and steam radiators for heating buildings; [ electric heating fans; ] convector heaters and heat exchangers; cast-iron, steel and aluminum radiators for heating; [ radiators for heating buildings; ] air conditioning units; air filters for air conditioning units; [ central air-conditioning installations; ] water-water and air-water heat pumps; [ water-water, ] air-air [ and air-water ] heat exchangers; [under floor heating systems composed primarily of tubes, distributing devices, valves, and insulation; thermostatic valves; ] and structural parts for the aforementioned goods [, including thermostatic valves ]