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; Air-conditioning apparatus; Air-conditioning, air cooling and ventilation apparatus and instruments; Air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter; Air exchangers for cleaning and purifying air; Bathroom exhaust fans; Central air-conditioning installations for industrial purposes; Dampers, namely, control devices used in air ducts to regulate the flow of air; Direct vents for gas appliances; Drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; Exhaust hoods for kitchens; Filters and filtering devices for air and gas conditioning; Heat sinks for use in heating, cooling and ventilating apparatus; Heat sinks for use in 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; Ventilating exhaust fans for household use, gymnasiums, pet houses; Ventilating louvers; Ventilation fan accessories, namely, grilles; Ventilation hoods; Ventilation hoods for stoves