HF-radial roof fans are excellently suitable for the extraction of aggressive exhaust air

and gases. Radial impellers are driven directly by an installed motor (impeller flush on the

motor shaft). The delivered medium flows through the ventilator in axial direction. The

motor is fully encapsulated by the exhaust airflow.

The fan housing of this series are made on request in polypropylene (PP,PPs/pp-FR),

polyethylene (PE), polyvinyl chloride (PVC) and in other thermoplastics. The housing is

deep-drawn and the impeller made in PPs/PP-FR as standard. Depending upon the

circumferential speed, other impeller materials become necessary (e.g. for nominal size

400, at 1430 1/min with a glass-fiber reinforced plastic impeller). A statically and

dynamically balanced impeller (quality class Q 6.3 to VDI 2056), in conjunction with a

flow-optimized fan housing, ensures very quiet run.