Eco-friendly cooling technology based on natural water evaporation. Lightweight, compact, decentralized units primarily used in industrial halls and buildings with partial commercial use where air conditioning is not economically feasible due to size. Evaporative cooling provides clean outdoor air and maintains high air quality with minimal maintenance. Units can supply outdoor air year-round, with cooling activated only when needed. The units are powered by an efficient EC motor fan from Ziehl Abbeg.