Conditioned fresh air with a temperature of 20°C in the summer and 25°C in the winter, Compact structure (fresh air fan + exhaust air fan +aluminum plate type heat exchanger + evaporator +condenser +compressor + cooling equipment), High efficient and direct driven AC Fans with low noise level, Proper ventilation by fan speed control having 5 levels for exhaust air and fresh air controlled separately, Easy installation and maintenance by compact design, Aluminum plate type heat exchangers with high conductivity and performance, High indoor air quality with washable polyurethane filters.