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EC Backward Curved Centrifugal Fans

EC Backward Curved Centrifugal Fans

Energy saving EC technology is used to motorise backward curved impellers designed to be quiet and efficient.

External rotor motors are usually contained within the depth of the fan impeller, 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.

EC backward curved centrifugal fans develop pressure within the envelope of the impeller and do not, therefore, rely on a scroll housing for this purpose. They are relatively low cost and can be simply and cheaply housed. Air is drawn through a radius inlet ring, which minimises pressure losses and air leakage, and is discharged at 90° to the inlet axis. The impeller has a ‘non-overloading’ characteristic in that it draws maximum power near the centre of its pressure/volume flow curve.

Low-cost speed control is possible for EC fans by supply voltage variation, either by an electronic (triac) method or by a transformer.

B Wheel Motorised Impeller

GKHR (xxx) CIE – Motorised Impeller (EC)
GKHM (xxx) CIE – Fan Module / Plug Type (EC)

EKHR / DKHR – Motorised Impeller (AC)
EKHM / DKHM – Fan Module (AC)

Fan Type
Voltage (V)
Frequency (Hz)
Input Power (kW)
Rated Current (A)
Speed (rpm)
Max Air Temperature (°C)
IP Rating (IP)
Sound Power Level dB(A)
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GKHR 315-CIE.088.4EA or GKHM 315-CIE.088.4EA 230 50 / 60 0.5 2.8 2200 40 IP54 69
GKHR 355-CIE.112.4EA or GKHM 355-CIE.112.4EA 230 50 / 60 0.5 2.7 1650 40 IP54 69
GKHR 355-CIE.112.5FA or GKHM 355-CIE.112.5FA 230 50 / 60 1.12 5.0 2250 45 IP54 76
GKHR 355-CIE.112.5FA or GKHM 355-CIE.112.5FA 400 50 / 60 1.70 2.8 2600 40 IP54 79
GKHR 400-CIE.125.4FF or GKHM 400-CIE.125.4FF 230 50 / 60 0.5 2.8 1380 40 IP54 67
GKHR 400-CIE.125.5HF or GKHM 400-CIE.125.5HF 400 50 / 60 1.60 2.5 2100 40 IP54 74
GKHR 400-CIE.125.5FA or GKHM 400-CIE.125.5FA 230 50 / 60 1.16 5.2 1875 40 IP54 73
GKHR 450-CIE.136.5FA or GKHM 450-CIE.136.5FA 230 50 / 60 1.15 5.1 1550 40 IP54 71
GKHR500-CIE.154.5HF or GKHM500-CIE.154.5HF 230 50 / 60 1.15 5.1 1330 40 IP54 71
GKHR 450-CIE.136.5HF or GKHM 450-CIE.136.5HF 400 50 / 60 1.65 2.7 1775 40 IP54 75
GKHR 450-CIE.135.6FF or GKHM 450-CIE.135.6FF 400 50 / 60 3.50 5.1 2300 40 IP54 84
GKHR 450-CIE.135.6FF or GKHM 450-CIE.135.6FF 400 50 / 60 1.50 2.4 1425 40 IP54 80
GKHR 500-CIE.154.6FF or GKHM 500-CIE.154.6FF 400 50 / 60 2.90 4.4 1800 60 IP54 80
GKHR 560-CIE.175.6IF or GKHM 560-CIE.175.6IF 400 50 / 60 3.26 5.0 1550 50 IP54 80
EKHR315-4_E088.4EC or EKHM315-4_E088.4EC 230 50 0.145 0.70 1370 70 IP54 58
DKHR315-4_E088.4EC or DKHM315-4_E088.4EC 400 50 0.15 0.36 1390 70 IP54 58
EKHR355-4_E112.5FA or EKHM355-4_E112.5FA 230 50 0.31 1.50 1400 50 IP54 63
DKHR335-4_E112.5DF or DKHM335-4_E112.5DF 400 50 0.29 0.67 1385 60 IP54 63
EKHR400-4_E125.5FA or EKHM400-4_E125.5FA 230 50 0.55 2.60 1390 65 IP54 64
DKHR400-4_E125.5FA or DKHM400-4_E125.5FA 400 50 0.49 0.93 1345 70 IP54 64
EKHR450-4_E136.6FA or EKHM450-4_E136.6FA 230 50 0.92 4.36 1410 45 IP54 69
DKHR450-4_E136.6FA or DKHM450-4_E136.6FA 400 50 0.88 1.88 1400 65 IP54 69
EKHR500-4_E154.6HF or EKHM500-4_E154.6HF 230 50 1.49 6.80 1385 40 IP54 72
DKHR500-4_E154.6HF or DKHM500-4_E154.6HF 400 50 1.40 2.90 1395 70 IP54 72
DKHR560-4_E175.6LA or DKHM560-4_E175.6LA 400 50 2.20 4.30 1330 50 IP54 72

E Wheel Motorised Impeller

GKHR (xxx) CIB – Motorised Impeller (EC)
GKHM (xxx) CIB – Fan Module / Plug Type (EC)

GKHB (xxx) CEB – Mounting Stand (EC)

Fan Type
Article Number
Voltage (V)
Frequency (Hz)
Input Power (kW)
Rated Current (A)
Fan Speed (min-1)
Max Air Temperature (°C)
IP Rating (IP)
GKHR (kg)
GKHM (kg)
GKHB (kg)
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GKHR250-CIB.080.4EA IE or GKHM250-CIB.080.4EA N86-25300 or N88-25300 Single Phase 230 V 50 / 60 0.48 2.8 2850 40/60 IP54 5.2 11
GKHR280-CIB.090.5FA IE or GKHM280-CIB.090.5FA IE N86-28303 or N88-28303 Single Phase 230 V 50 / 60 1.1 6.3 3000 40/60 IP54 10 16
GKHR280-CIB.090.5FA or GKHM280-CIB.090.5FA N86-28301 or N88-28301 3 Phase 400 V 50 / 60 1.6 2.5 3500 40/60 IP54 10 16
GKHR 315-CIB.100.4EA IE or GKHM 315 CIB 100 4EA Single Phase 230V 50 / 60 0.43 2.5 1850 40/60 IP54 6 14
GKHR 315-CIB.100.5FA IE or GKHM 315-CIB.100.5FA N86-31801 or N88-31801 Single Phase 230 V 50 / 60 1.0 6.2 2400 40/60 IP54 10.5 18.5
GKHR 315-CIB.100.5FA IE or GKHM 315-CIB.100.5FA N86-31804 or N88-31804 3 Phase 400 V 50 / 60 1.6 2.6 2900 40/60 IP54 10.5 18.5
GKHR 355-CIB.112.6FF IE or GKHM 355-CIB.112.6FF N86-35801 or N88-35801 3 Phase 400 V 50 / 60 3.3 4.8 3000 40/60 IP54 21 31
GKHR 400-CIB.125.6FF IE or GKHM 400-CIB.125.6FF IE N86-40300 or N88-40300 3 Phase 400 V 50 / 60 3.5 5.3 2600 40/60 IP54 21.5 38
GKHR 450 CIB.140.6IF or GKHM 450 CIB.140.6IF N86-45300 or N88-45300 3 Phase 230 V 50 / 60 3.6 5.2 2150 40/60 IP54 27 47
GKHR 450 CIB.140.6IF or GKHM 450 CIB.140.6IF N88-45350 3 Phase 400 V 50 3.3 8.4 2050 40/60 IP54 68
GKHR 500-CIB.160.6IF IE or GKHM 500-CIB.160.6IF IE N86-50300 or N88-50300 3 Phase 400 V 50 / 60 3.6 5.3 1750 40/60 IP54 28 55
GKHR560-CIB.180.6IF IE or GKHM560-CIB.180.6IF IE N86-56300 or N-8856300 3 Phase 400 V 50 / 60 3.3 4.8 1450 40/60 IP54 30 62
GKHR 630-CIB.200.6NA IE or GKHM 630-CIB.200.6NA IE N86-63302 or N88-63302 3 Phase 230 V 50 / 60 3.1 7.7 1140 40/60 IP54 37 74
GKHR 630-CIB.200.6NA IE or GKHM 630-CIB.200.6NA IE N86-63301 or N88-63301 3 Phase 400 V 50 / 60 3.3 5.0 1181 40/60 IP54 37 74
GHKB 630-CEB.200.8LA N88-63350 3 Phase 400 V 50 6.6 9.8 1500 40/60 IP54 107
GKHB 710 CEB 200 8LA N88-71352 3 Phase 400 V 50 6.9 11.0 1280 40/60 IP54 107

RRE & RRM Motorised Impellers

RRE – Motorised Impeller
RRM – Fan Module With Mounting Stand

Fan Type
Article Number
Voltage (V)
Frequency (Hz)
Motor Power Input (kW)
Rated Current (A)
Fan Speed (min-1)
Max Air Temperature (°C)
IP Rating (IP)
RRE (kg)
RRM (kg)
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RRE G9 192x40R or RRM G9 192X40R K49-A4-1 or L38-B2-1 230 50 / 60 0.14 1.15 3990 50 IP4X 1.2 1.5
RRE G9 225x63R or RRM G9 225x63R K49-A6-1 or L38-B4-1 230 50 / 60 0.150 1.19 2780 50 IP4x 1.7 3.0
RRE G9 225x50R 230 50 / 60 0.121 1.0 3350 50 IP4x 1.7

Technical Articles

Read our technical article on What causes an unbalanced impeller?

Applications

Electrical Enclosures Cabinets Axair Online Data Centre
Fan Coil Unit

Products in this Range

B Wheel Motorised Impeller

Designed to increase energy efficiency by up to 6% and reduce noise by 3 decibels

E Wheel Motorised Impeller

The latest design which significantly increases energy efficiency and reduces operating noise levels

RRE & RRM Backward Curved Centrifugal Fan

High performance motorised impeller and fan module with efficient EC motors

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