Water cooling towers and systems; evaporative condensers and fluid coolers, including closed circuit fluid coolers; fans; air coolers, including indirect evaporative air coolers and direct evaporative air coolers; heat exchangers in this class; air conditioners, including dual cycle air conditionsers, which combine indirect or direct evaporative air coolers with dehumidification systems, and High Volume Air Conditioners (HVAC), which include drying systems incoporating any of the aforementioned systems and products; and parts and accessories therefor