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Reversed Backward Curved Centrifugal - Motorised Impeller


Standard backward-curved motorised impellers must be installed with a radiussed inlet ring to obtain published performance (see our product section on backward -curved motorised impellers).The inlet ring must be sourced as an accessory, and the correct clearance from the impeller must be maintained in order to optimise air performance.

The reversed backward curved motorised impeller is pre-assembled to its inlet ring. The impeller is reverse-mounted on the external rotor motor, drawing air through an inlet ring attached to the motor back-plate. The ring then functions as both radiussed inlet and a mounting facility for the complete unit. The fan is then immediately ready for assembling into equipment and for connection to the electrical supply. Finger guards are available for all models.

6 sizes of impeller are available in diameters 180, 192, 220, 225, 250 and 280.

Low cost speed control is possible by supply voltage variation, either by electronic (triac) method or by transformer.


Industrial equipment, air filters, electronic enclosures, solarium equipment, roof extract units, high pressure coils, air conditioning cassettes, refrigeration equipment.

Technical Specification

Specification Description
Motor Type

External rotor motor, in the airstream


Single phase 230 or 115Volts

Protection IP44

Backward curved steel, aluminium, and plastic


Space saving short axial length. Low cost speed control


Pre-assembled to inlet ring

Pressure Medium
Speed Control Voltage variation

Ø180 to 280 impeller

Flow Rate

280m³/h range maximum


700 Pascals range maximum