Air-conditioning, air cooling and ventilation apparatus and instruments; Air impellers for ventilation; Drying apparatus for use in heating, ventilation systems, air conditioning systems and refrigeration systems; Filters for air conditioning; Heat sinks for use in heating, cooling and ventilating apparatus; Interior environment control system for commercial buildings, namely, heaters, ventilators and humidifiers all sold as a unit; Ventilating exhaust fans; Ventilating louvers; Ventilation a...