Rooftop Air Conditioning unit With the obvious advantages of extraordinary structure, elegant appearance, complete function, "GRAD" brand air conditioner, including vertical (air volume from 2000 ~ 60000m3 / h ... 2000 ~ 60000m3 / h) and ceiling-type (air volume from 1000 ~ 16000m3 / h) three major series, can meet the cooling, heating, humidification, dehumidification ...