Air-conditioning, air cooling and ventilation apparatus and instruments; Air cleaning apparatus; Air cooling apparatus; Air filtering units; Air sterilisers; Dampers, namely, control devices used in air ducts to regulate the flow of air; Disinfectant apparatus; Filters and filtering devices for air and gas conditioning; Filters for air conditioning; Gas furnaces; Heat pumps; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel switches, and electrical wire, all sold as a unit; Hot water heating installations; Radiators; Replacement parts for heating installations, namely, boilers; Space cooling apparatus; Steam generating installations; Tap water purifying apparatus; Water softening apparatus and installations