Installation, laying, repair, maintenance, trade and representation of ventilation, air conditioning and heating systems using air, water and alternative energies, air treatment, sanitary systems, building and industrial sheet metal work, construction, laying, trade and representation of all types of chimneys, ventilation system cleaning. The company may also, in connection with its purpose, acquire, own and sell real estate. The company may open branches and subsidiaries in Switzerland and abroad and participate in other companies in Switzerland and abroad. The company may also carry out all commercial, financial or other activities that are related to the purpose of the company.