•External rotor motor protected through thermal contact
•0-100% regulable speed
•Balanced according DIN1940, class G2,5
•Ball bearings for temperatures till -30°C
•Sickle shaped aluminium sheet blades special to work at a very low noise level
•Inlet airflow way "V" or outlet "A", to choose
•2 speed motors for connection Δ/Y
•Other tensions and executions on request
•Several constructive options: T1, T2, T3