SF.1 is an AC "Dry" or "Through flow" motor at high speed. Motor suitable for the suction of the dust only, this are not suitable for liquid passage. The fan inside the suction body, sucks the air and pushes it through the motor. The air is used to cool the motor.
It guarantees high performances in a compact design.
AC motor, diameter 110mm, Insulation class I, 1 stage.