Refrigeration, air-conditioning and air cooling systems and apparatus and installations including heat exchangers, condensers, evaporators, filters, fans; water filtering apparatus; water distribution installations; humidifiers; evaporative cooling systems and apparatus; air cooling apparatus; parts and accessories for all the aforementioned systems and apparatus including filter pads, cooling pads, filter media for air-conditioning and ventilation, evaporative cooling media, wet wall pads, ventilation pads including tunnel ventilation pads and air-conditioning filters