Flues and installations for the discharge of exhaust gases; burners, boilers and heating appliances; heating, ventilation, air-conditioning and air-purifying appliances and installations; fireplaces; personal heating and drying appliances; control and safety accessories for water and gas installations; sanitary installations and devices, water supply installations; chimney dampers; flues for chimneys; flue shafts for heating appliances; combustion ducts for heating boilers; heating, ventilati...