Heat pump fresh air handle unit with heat recovery 1.heat recovery function 2.R22, R410a, R134a 3.heat pump type Heat pump fresh air handle unit with heat recovery1.heat recovery function2.R22 ... , R134a3.heat pump typeFeature:High grade configuration, reliable runningFully fresh air, high air qualityIndependent fresh air refrigerant systemNo need of cooling tower and outdoor unitTotal heat recovery ...