Directly operated electric motor makes it compact.All machine types have been equipped with a low-noise all enclosed fan cooler, making it possible to use both indoors and outdoors.A patented analysis of the impeller and a an adapted casing has allowed for a great improvement of the motor's efficiency.It is also possible to seelect an output 1rank smaller than that of traditional machines. Enhanced safety as a result of a installable protector on the exposed rotor.