Air-conditioning, air cooling and ventilation apparatus and instruments; Air filtering installations; Air purification units; Dryers used for the removal of solid, liquid and vapor contaminants from compressed air and gases; Heat sinks for use in heating, cooling and ventilating apparatus; Heating systems for residential and commercial buildings comprised of biomass burners, boilers, valves, pipes, manifolds, solar panels, control panels, switches and electrical wire, all sold as a unit; Hydr...