Architecture and Planning, Heating, ventilation and air conditioning (HVAC) plant for corrosive atmospheres, Heating, ventilation, air conditioning (HVAC) and refrigeration equipment, Construction, Heating, ventilation and air conditioning (HVAC) plant for clean rooms, Heating, ventilation and air conditioning (HVAC) plant for computer rooms, Ventilation, air conditioning (VAC) plants, Maintenance services for gas cleaning plant and equipment, Dust extraction equipment, by use, Air filtration plants to customer specification