1. Fresh air unit, HRV, HRU 2. Air flow: 1000~ ... 4. Heat pump built in, scroll compressor Heat recovery fresh air handling unit Features:1. Air flow: 1000~35000m3/ ... expansion valve, solenoid valve,etc.3. Fresh air condition, high air quality Introduce fresh air from outside, discharge indoor polluted air ... no need to start the compressor, just run the fresh air fan and exhaust air fan, it can exchange ...