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