https://m.westaflex.com/produkt/projektbedarf/akustik The core component of the system is the central control unit which needs barely more space than the average suitcase. A cross-current flow heat exchanger is operational within it that can regain more than 90 percent of the exhaust heat. The volume flow rate is uniformly regulated even if the filters are contaminated or there is a lull in the wind around the building. https://m.westaflex.com/logo.png