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Forward Curved Centrifugal Fans - Double inlet - external rotor motor

Design

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. Some of the smaller double inlet fans are IP54 protected to enhance the dust protection, and are resilient mounted at each shaft end to reduce the transmission of vibration.

Low cost speed control is possible by supply voltage variation, either by electronic (triac) method or by transformer. Detachable discharge flanges enable 'without flange' or special mounting arrangements to be specified.

Application

Air filtration, fume control, heating and cooling coils, small air handling units, solarium equipment, special effects equipment, electronic heatsink cooling.

Technical Specification

Specification Description
Motor Type External rotor motor, in the airstream
Supply

Single and three phase models

Protection IP44 and IP54
Impellers

Forward and backward curved models

Features

Efficient, low power consumption motor Low cost speed control Slim and standard scroll housings

Mounting

Discharge flange or scroll brackets

Pressure Medium
Speed Control Voltage variation
Size

Ø120 to 560 impeller

Flow rate

26000m³/h range maximum

Pressure

1300 Pascals range maximum