... cross flow passages, sensible heat exchanger.2. Fresh air filtersTriple filtration to ensure air cleanness, G4+F7+H10.Aluminum frame, solid, ... 4. Bypass systemBy adjusting the opening angle, different fresh air volume can go through theheat exchanger and by-pass synchronously ... . When it’s opened completely, the air goes without passing the heat exchanger. 5. Compressors Made ...