RadiCal: Low-pressure centrifugal fans with backward-curved blades

Backward-curved fan blades with a rigid, hybrid design

RadiCal centrifugal fans with backward-curved blades are the new standard in ventilation and air-conditioning. Radical features include both noise minimisation and a further decrease in energy consumption. The RadiCal impeller with backward-curved blades is made of fibreglass-reinforced plastic, enabling an aerodynamically optimised shape that cuts the noise level in half and reduces power requirements significantly.

  • Optimised RadiCal impeller with backward-curved blades
  • Motor-electronics combinations
  • RadiCal – the new standard in ventilation and air-conditioning technology
  • RadiCal low-pressure centrifugal fans from ebm-papst – facts at a glance
  • Product search for centrifugal fans RadiCal

Optimised RadiCal impeller with backward-curved blades

The designs for the impeller and the backward-curved blades were optimised with complex simulation models adjusted using measurements on prototypes. The result is an optimal, low-loss flow of air through the impeller without the drastic cross-sectional jumps that cause losses in the impeller. A uniform flow profile without laminar separation results in fewer noise sources and better acoustics. The plastic's good damping characteristics also help reduce noise emissions.

The impellers are produced from a special composite material, in a single piece without joints. This makes a high circumferential speed possible, so the fan has a high power density.

Even without special varnish, the impellers are highly corrosion-resistant, for example if exposed to salt water or salty air. Direct solar radiation has no damaging effects on the UV-resistant material.

Compact low-pressure series with miniaturised motor-electronics combinations

GreenTech EC motors are used in the RadiCal low-pressure centrifugal fans. In terms of efficiency, they exceed legally mandated ErP limits. With these, up to 50% less energy consumption can be achieved in comparison with AC solutions.

The motors in RadiCal low-pressure centrifugal fans have been miniaturised and are much more compact than their predecessors. With the current dimensions, easy and trouble-free replacement of existing AC solutions is possible at any time.

The motor's heat management system also has an optimised design. The stator is completely encapsulated in high-performance plastic. Air inlets in the rotor guarantee perfect heat dissipation for the motor, resulting in a further considerable increase in efficiency. The high level of IP protection permits the use of these fans even in critical applications.

The RadiCal with GreenTech EC motor features continuous control with a 0-10 V or PWM input signal. Versions with two fixed speed levels are available up to size 250 mm, with the higher speed providing a power reserve in comparison with the AC version. From size 250 mm, control via an RS-485 interface using the MODBUS RTU protocol is also possible.

RadiCal – the new standard in ventilation and air-conditioning technology

RadiCal centrifugal fans with backward-curved blades are used in many ventilation and air-conditioning applications such as control cabinet cooling, in-line duct fans, home ventilation units or heat pumps. In all of these applications, it pays to switch to the high-efficiency RadiCal low-pressure centrifugal fans with GreenTech EC motors or to opt for them from the outset.

RadiCal low-pressure centrifugal fans from ebm-papst – facts at a glance:

  • Perfectly matched components (controller/motor/impeller)
  • High efficiency with improved ventilation technology and new EC motors
  • Significantly reduced rotation noise
  • Unmatched compactness
  • Mechanical compatibility of AC and EC fans
  • EC fans with 2 speed levels or continuously adjustable
  • High power density
  • Rugged design and maintenance-free operation
  • Very easy commissioning
  • Fulfils ErP specifications

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Phase  
Nominal voltage in V
Type of voltage  
Frequency in Hz
Air flow in m³/h
-
Dimensions in mm

117 centrifugal fans with backward curved blades found.

Type  n ~ D/Y qV UN f AC/DC
in min-1  in m³/hin Vin Hz 
K2E133-RA03-01
27001~ 19023050AC
31001~ 22523060AC
K2E190-RA26-01
23501~ 53023050AC
25001~ 59023060AC
K2E220-RA38-01
21001~ 88523050AC
20501~ 92023060AC
K2E220-RB06-01
25001~ 95023050AC
26501~ 105023060AC
K2E225-RA92-01
25001~ 115023050AC
26001~ 130023060AC
K2E250-RA50-01
25001~ 144023050AC
24501~ 158023060AC
K3G133-RA01-01
37701~ 150200 .. 24050/60AC
K3G133-RA01-03
37701~ 150200 .. 24050/60AC
K3G190-RB01-01
27101~ 350200 .. 24050/60AC
K3G190-RD45-01
41201~ 510200 .. 24050/60AC
K3G190-RD45-03
41201~ 510200 .. 24050/60AC
K3G220-RC05-01
25801~ 625200 .. 24050/60AC
K3G220-RC05-03
25801~ 625200 .. 24050/60AC
K3G220-RD21-01
32301~ 800200 .. 24050/60AC
K3G225-RD05-01
22001~ 640200 .. 24050/60AC
K3G225-RD05-03
22001~ 640200 .. 24050/60AC
K3G225-RE07-01
28601~ 960200 .. 24050/60AC
K3G225-RE07-03
28601~ 960200 .. 24050/60AC
K3G250-AT39-56
30001~ 1500200 .. 27750/60AC
K3G250-AT39-72
30001~ 1500200 .. 27750/60AC
K3G250-AT39-74
30001~ 1500200 .. 27750/60AC
K3G250-AV29-B2
34501~ 2000200 .. 27750/60AC
K3G250-AV29-B4
34501~ 2000200 .. 27750/60AC
K3G250-AV29-B6
34501~ 1800200 .. 27750/60AC
K3G250-AV29-B9
34501~ 2000200 .. 27750/60AC
K3G250-AY11-C2
35803~ 2000380 .. 48050/60AC
K3G250-AY11-C4
35803~ 2000380 .. 48050/60AC
K3G250-RD43-01
19551~ 64023050/60AC
K3G250-RE07-07
25101~ 870200 .. 24050/60AC
K3G250-RE09-05
25101~ 900200 .. 24050/60AC
K3G280-AT04-72
24001~ 2250200 .. 27750/60AC
K3G280-AT04-74
24001~ 2250200 .. 27750/60AC
K3G280-AU06-B2
28001~ 2005200 .. 27750/60AC
K3G280-AU06-B4
28001~ 2005200 .. 27750/60AC
K3G280-AU06-B6
28001~ 2005200 .. 27750/60AC
K3G280-AU11-C2
31003~ 2200380 .. 48050/60AC
K3G280-AU11-C4
31003~ 2200380 .. 48050/60AC
K3G280-AU11-C6
31003~ 2200380 .. 48050/60AC
K3G310-AX52-35
25803~ 2940380 .. 48050/60AC
K3G310-AX52-90
25803~ 2940380 .. 48050/60AC
K3G310-AX52-91
25803~ 2940380 .. 48050/60AC
K3G310-AX54-22
28501~ 2790200 .. 27750/60AC
K3G310-AX54-52
28501~ 2790200 .. 27750/60AC
K3G310-BB49-02
31403~ 2900380 .. 48050/60AC
K3G310-BB49-32
31403~ 2900380 .. 48050/60AC
K3G355-AX56-90
21403~ 3390380 .. 48050/60AC
K3G355-AX56-91
21403~ 3390380 .. 48050/60AC
K3G355-AY40-02
26003~ 4140380 .. 48050/60AC
K3G355-AY40-32
26003~ 4140380 .. 48050/60AC
K3G355-AY40-35
26003~ 4140380 .. 48050/60AC
K3G355-AY43-22
24501~ 3750200 .. 27750/60AC
K3G355-AY43-52
24501~ 3750200 .. 27750/60AC
K3G355-BC92-02
28003~ 4350380 .. 48050/60AC
K3G355-BC92-32
28003~ 4350380 .. 48050/60AC
K3G400-AQ23-01
25503~ 5400380 .. 48050/60AC
K3G400-AQ23-31
25503~ 5400380 .. 48050/60AC
K3G400-AQ23-35
25503~ 5400380 .. 48050/60AC
K3G400-AQ23-68
26803~ 6700380 .. 48050/60AC
K3G400-AY87-02
21803~ 4600380 .. 48050/60AC
K3G400-AY87-32
21803~ 4600380 .. 48050/60AC
K3G450-AQ25-68
20403~ 6000380 .. 48050/60AC
K3G450-AY86-02
17503~ 5300380 .. 48050/60AC
K3G450-AY86-32
17503~ 5300380 .. 48050/60AC
K3G450-AZ24-68
27503~ 7500380 .. 48050/60AC
K3G450-AZ30-35
27503~ 7980380 .. 48050/60AC
K3G500-AP25-01
17803~ 8000380 .. 48050/60AC
K3G500-AP25-31
17803~ 8000380 .. 48050/60AC
K3G500-AP25-68
19103~ 8000380 .. 48050/60AC
K3G560-AQ08-68
17503~ 9800380 .. 48050/60AC
K3G630-AP01-01
11303~ 13000380 .. 48050/60AC
K3G710-AP02-01
9203~ 13000380 .. 48050/60AC
R2E133-RA03-01
27001~ 19023050AC
31001~ 22523060AC
R2E190-RA26-05
23501~ 53023050AC
25001~ 59023060AC
R2E220-RA38-01
21001~ 88523050AC
20501~ 92023060AC
R2E220-RB06-01
25001~ 95023050AC
26501~ 105023060AC
R2E225-RA92-09
25001~ 115023050AC
26001~ 130023060AC
R2E250-RA50-01
25001~ 144023050AC
24501~ 158023060AC
R2E250-RB06-01
27501~ 146023050AC
31001~ 167023060AC
R3G133-RA01-01
37701~ 150200 .. 24050/60AC
R3G133-RA01-03
37701~ 150200 .. 24050/60AC
R3G190-RB01-01
27101~ 350200 .. 24050/60AC
R3G190-RC05-03
32001~ 520200 .. 24050/60AC
R3G190-RD45-01
41201~ 510200 .. 24050/60AC
R3G190-RD45-03
41201~ 510200 .. 24050/60AC
R3G220-RC05-01
25801~ 625200 .. 24050/60AC
R3G220-RC05-03
25801~ 625200 .. 24050/60AC
R3G225-RD05-01
22001~ 640200 .. 24050/60AC
R3G225-RD05-03
22001~ 640200 .. 24050/60AC
R3G225-RE07-01
28601~ 960200 .. 24050/60AC
R3G225-RE07-03
28601~ 960200 .. 24050/60AC
R3G250-AT39-71
30001~ 1500200 .. 27750/60AC
R3G250-AV29-B1
34501~ 2000200 .. 27750/60AC
R3G250-AY11-C1
35803~ 2000380 .. 48050/60AC
R3G280-AT04-71
24001~ 2250200 .. 27750/60AC
R3G280-AU06-B1
28001~ 2005200 .. 27750/60AC
R3G280-AU11-C1
31003~ 2200380 .. 48050/60AC
R3G310-AX52-90
25803~ 2940380 .. 48050/60AC
R3G310-AX54-21
28501~ 2790200 .. 27750/60AC
R3G310-BB49-01
31403~ 2900380 .. 48050/60AC
R3G355-AX56-90
21403~ 3390380 .. 48050/60AC
R3G355-AY40-01
26003~ 4140380 .. 48050/60AC
R3G355-AY43-21
24501~ 3750200 .. 27750/60AC
R3G355-BC92-01
28003~ 4350380 .. 48050/60AC
R3G400-AQ23-01
25503~ 5400380 .. 48050/60AC
R3G400-AQ23-68
26803~ 6700380 .. 48050/60AC
R3G400-AY87-01
21803~ 4600380 .. 48050/60AC
R3G450-AQ25-68
20403~ 6000380 .. 48050/60AC
R3G450-AY86-01
17503~ 5300380 .. 48050/60AC
R3G450-AZ24-68
27503~ 7500380 .. 48050/60AC
R3G450-PA31-03
24803~ 7500380 .. 48050/60AC
R3G500-AP25-01
17803~ 8000380 .. 48050/60AC
R3G500-AP25-68
19103~ 8000380 .. 48050/60AC
R3G500-AQ31-68
22003~ 10000380 .. 48050/60AC
R3G560-AQ08-68
17503~ 9800380 .. 48050/60AC
R3G630-AP01-01
11303~ 13000380 .. 48050/60AC
R3G710-AP02-01
9203~ 13000380 .. 48050/60AC
R6E355-AB28-10
9101~ 183023050AC
10001~ 200023060AC
Legend
n = Speed
~ = Phase
D/Y = Connection
qV = Air flow
UN = Nominal voltage
f = Frequency
AC/DC = Type of voltage