Air-conditioning apparatus; Air-conditioning apparatus and installations; Air-conditioning installations; Air-conditioning, air cooling and ventilation apparatus and instruments; Air conditioning apparatus; Air conditioning apparatus and installations; Air conditioning installations; Boilers for heating installations; Central heating radiators; Heat accumulators; Heat exchangers not being parts of machines; Heat exchangers, other than parts of machines; Heat generators; Heat pumps; Heat recovery ventilators; Heating elements; Heating installations; Heating panels used for indoor heating purposes; Accessories for fireplaces, namely, air circulation kits consisting primarily of metal ducts and metal adaptors used to increase the amount of heat recovered from the fireplace using a blower or natural convection; Apparatus for the exchange of substances and heat for use in the production of steam, for use in cooking and for use in refrigeration; Central air-conditioning installations; Central heating boilers; Components for air conditioning and cooling systems, namely, evaporative air coolers; Drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; Electric heaters for commercial use; Electronic generator for use in controlling the amount of humidity in the air by creating, removing or circulating small water particles or water vapor in the air; Fans for air conditioning apparatus; Filters and filtering devices for air and gas conditioning; Furnace boilers; Gas fired water heaters; Heating boilers; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, control panel switches, and electrical wire, all sold as a unit; Heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, solar panels, control panel, switches and electrical wire, all sold as a unit; 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; Hot water tanks; Humidifiers for central heating radiators; Industrial boilers; Parts for heating and air conditioning systems, namely, heater cores and gas coolers for vehicles; Radiators; Steam heating apparatus; Stoves being heating apparatus; Ventilating exhaust fans; Ventilating, high-velocity fixed exhaust fans for commercial and agricultural use; Ventilating, high-velocity portable exhaust fans for commercial and agricultural use