In DM series units, the electric engine has been manufactured as to remain outside air flow. These units are used for discharge of air with high temperature and high particle concentration. The body of the unit has been produced of galvanized steel and it can be directly assembled to channels with rectangular cross-sections. It is manufactures as suitable for indoors and -as optionally- outdoors. Engines are directly coupled to fan, and it is delivered as being packed after being testes at quality control unit following the dynamic balance adjustments.