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Forward Curved Centrifugal Fans - Single inlet - external rotor motor


External rotor motors are usually contained within the width of the fan housing, thus saving the space normally occupied by a standard motor. They are located in the air stream, so temperature is limited, and are generally of protection class IP44, so the air needs to be clean and dry to avoid motor contamination.

Low cost speed control is possible by supply voltage variation, either by electronic (triac) method or by transformer. As the scroll housings of single inlet fans are in fabricated steel it is possible to have detachable discharge flanges, which means that the fan can be mounted on its air inlet side.


Air filtration, spray containment, fume control, inflatable products, low profile air handling units, attenuated fan boxes, solarium equipment, conveyor cooling, electronic enclosure ventilation

Technical Specification

Specification Description
Motor Type External rotor motor, in the airstream

Single and three phase models

Protection IP44

Forward and backward curved models


Space saving. Slim and standard scrolls. Low cost speed control


Scroll brackets or feet, discharge flange, adapted inlet

Pressure Medium
Speed Control Voltage variation

Ø108 to 560 impeller

Flow Rate

10000m³/h maximum


1100 Pascals maximum