Casing
Airtight, seamed casing made from galvanised steel. Leakage rate compliant with tightness class C, according to EN 12237:2003.
Motor
Voltage controllable external rotor motors.
Impeller geometry
Radial impeller with backward curved blades.
Power control
Speed controllable via stepless thyristor or 5-step transformer.
Motor protection
Integrated thermal contacts with manual reset in accordance with EN60335-2-80 (sizes 100 M and 125 M have integrated thermal protection).