Ventilation hoods for laboratories; Ventilation fans, namely, ventilating exhaust fans and air supply fans; Recirculating fume hoods, namely, ventilation hoods and air filters; Environmental control apparatus, namely, fume hoods, fume hood blowers, laboratory blowers, and parts thereof; Air treatment apparatuses and installations for the treatment of air, namely, air filters, chemical air processing units, and devices for physical air treatment in the nature of air handlers, air exchangers, air ducts all for use in work chambers, containment areas and premises, in particular, hospitals, laboratories, and product plants for the protection of people and manufacturers of goods;Air-conditioning, air cooling and ventilation apparatus and instruments; Range hoods; Air sterilising apparatus; Air cooling apparatus; Environmental control apparatus comprised of VAV (variable air volume speed) dampers, air conditioning units, air handlers; Heating, ventilating and air conditioning (HVAC) equipment and components, namely, air diffusers, ventilation grilles and heat registers, air valves, variable air volume (VAV) damper valves, fan powered electrical and hot water heaters and coolers, and electric bypass ventilating fans; Air exchangers for cleaning and purifying air; Dampers, namely, control devices used in air ducts to regulate the flow of air; Air purifying apparatus and machines; Drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; Industrial apparatus using air for drying and cleaning components in the electronics, semiconductor, circuit board, pharmaceutical, medical, and food and beverage industries