The Rex Evaporative Coolers are an effective cooler with GWP 0 only using water to cool, no refrigerant! It’s an environmentally friendly cooling solution – a natural way of cooling. The M703 and the M902 COOL are best suited for any sultry and dusty environment: Factory, Garage, Warehouse, Greenhouse, Restaurant, Shop. And for industries like Aviation, Horticulture, Animal Farming etc. An effective built-in UVC light kills possible germs and viruses.