Air conditioners, air-conditioning installations; Air-conditioning ventilation installations and apparatus; Air-conditioning, air cooling and ventilation apparatus and instruments; Ventilation hoods; Electric fans for air-conditioning installations; Air conditioning filters; Air filters for air conditioning units; Air humidifiers; Valves for heating and cooling installations, namely, air control valves; Dampers, namely, control devices used in air ducts to regulate the flow of air; Air ducts ...