Single-inlet centrifugal arrangement with backward-curved impeller, documented by the selected model.
RAFAVENT backward-curved single-inlet centrifugal fan — representative belt-driven configuration.
RAFAVENT RF-CB-SI SERIES
Backward-Curved Single-Inlet Centrifugal Fans — Technical Selection Data
Single-width, single-inlet centrifugal fans with backward-curved impellers for ducted industrial ventilation, filtration and process-air duties.
RAFAVENT Engineering Calculation — Preliminary Selection — Non-Certified. Values are calculated at standard air density 1.20 kg/m³ using fan-law scaling and engineering assumptions. They are not laboratory-certified ratings. Airflow, pressure, power and sound values are not simultaneous guarantees. Final selection requires a confirmed duty point, arrangement and approved production drawing.
Construction and application
Welded or formed steel scroll casing with single inlet and backward-curved steel impeller.
Impeller production balancing and vibration acceptance are required before dispatch.
Direct drive is the preliminary basis through size 630; larger sizes use belt or project-engineered drive selection.
Three-phase IEC motor basis, IP55 and Class F specification subject to the approved motor datasheet.
Clean or lightly dust-laden non-corrosive air, preliminary ambient duty −20 to +50 °C. No ATEX, smoke or high-temperature certification is claimed.
Diameter 1600 is available only as custom manufacturing capability after engineering review; it is not part of this standard model series.
Model selection table
Model
Wheel Ø mm
rpm
Recommended Q m³/h
Recommended Ps Pa
Calculated max Q
Calculated peak Ps
Est. shaft kW
Preliminary motor selection kW
Supply
Est. LpA @3m dB(A)
Drive basis
RF-CB-SI-200
200
2900
219–400
166–353
487
415
0.04
0.12
230/400 V 3Ph
56 ±6
Direct
RF-CB-SI-250
250
2900
428–780
259–551
952
648
0.13
0.18
230/400 V 3Ph
61 ±6
Direct
RF-CB-SI-315
315
2900
857–1,561
412–875
1,903
1030
0.41
0.55
230/400 V 3Ph
66 ±6
Direct
RF-CB-SI-355
355
1450
613–1,117
131–278
1,362
327
0.09
0.12
230/400 V 3Ph
57 ±6
Direct
RF-CB-SI-400
400
1450
877–1,598
166–353
1,949
415
0.17
0.25
230/400 V 3Ph
59 ±6
Direct
RF-CB-SI-450
450
1450
1,249–2,275
210–446
2,775
525
0.31
0.37
230/400 V 3Ph
62 ±6
Direct
RF-CB-SI-500
500
1450
1,713–3,121
259–551
3,806
648
0.52
0.75
230/400 V 3Ph
64 ±6
Direct
RF-CB-SI-560
560
1450
2,406–4,385
325–691
5,348
813
0.92
1.1
230/400 V 3Ph
66 ±6
Direct
RF-CB-SI-630
630
1450
3,426–6,243
412–875
7,614
1030
1.65
2.2
230/400 V 3Ph
69 ±6
Direct
RF-CB-SI-710
710
960
3,247–5,917
229–487
7,215
573
0.87
1.1
230/400 V 3Ph
64 ±6
Belt / project drive
RF-CB-SI-800
800
960
4,645–8,464
291–619
10,322
728
1.58
2.2
230/400 V 3Ph
67 ±6
Belt / project drive
RF-CB-SI-900
900
960
6,613–12,051
368–783
14,697
921
2.85
4
400/690 V 3Ph
69 ±6
Belt / project drive
RF-CB-SI-1000
1000
960
9,072–16,531
455–966
20,160
1137
4.83
7.5
400/690 V 3Ph
71 ±6
Belt / project drive
RF-CB-SI-1120
1120
720
9,559–17,419
321–682
21,243
802
3.59
5.5
400/690 V 3Ph
69 ±6
Belt / project drive
RF-CB-SI-1250
1250
720
13,289–24,216
400–849
29,531
999
6.22
7.5
400/690 V 3Ph
71 ±6
Belt / project drive
RF-CB-SI-1400
1400
720
18,670–34,021
501–1065
41,489
1254
10.96
15
400/690 V 3Ph
74 ±6
Belt / project drive
Recommended flow and pressure ranges define an intended preliminary selection envelope; they are not opposite corners of a guaranteed duty point. Estimated free-field A-weighted sound pressure at 3 m has ±6 dB(A) uncertainty before duct, reflection, inlet, outlet, guard, silencer and system effects.
Calculated model curves
Open a model to view its six-point preliminary Q–Ps curve.
RF-CB-SI-200 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
299
2
97
382
3
195
415
4
292
357
5
390
216
6
487
0
RF-CB-SI-250 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
467
2
190
597
3
381
648
4
571
558
5
761
337
6
952
0
RF-CB-SI-315 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
741
2
381
947
3
761
1030
4
1,142
885
5
1,523
535
6
1,903
0
RF-CB-SI-355 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
235
2
272
301
3
545
327
4
817
281
5
1,090
170
6
1,362
0
RF-CB-SI-400 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
299
2
390
382
3
780
415
4
1,169
357
5
1,559
216
6
1,949
0
RF-CB-SI-450 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
378
2
555
483
3
1,110
525
4
1,665
452
5
2,220
273
6
2,775
0
RF-CB-SI-500 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
467
2
761
597
3
1,522
648
4
2,284
558
5
3,045
337
6
3,806
0
RF-CB-SI-560 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
586
2
1,070
748
3
2,139
813
4
3,209
700
5
4,278
423
6
5,348
0
RF-CB-SI-630 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
741
2
1,523
947
3
3,046
1030
4
4,568
885
5
6,091
535
6
7,614
0
RF-CB-SI-710 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
413
2
1,443
527
3
2,886
573
4
4,329
493
5
5,772
298
6
7,215
0
RF-CB-SI-800 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
524
2
2,064
669
3
4,129
728
4
6,193
626
5
8,258
378
6
10,322
0
RF-CB-SI-900 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
663
2
2,939
847
3
5,879
921
4
8,818
792
5
11,757
479
6
14,697
0
RF-CB-SI-1000 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
819
2
4,032
1046
3
8,064
1137
4
12,096
978
5
16,128
591
6
20,160
0
RF-CB-SI-1120 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
578
2
4,249
738
3
8,497
802
4
12,746
690
5
16,994
417
6
21,243
0
RF-CB-SI-1250 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
719
2
5,906
919
3
11,812
999
4
17,719
859
5
23,625
520
6
29,531
0
RF-CB-SI-1400 — calculated Q–Ps curve
Point
Q (m³/h)
Ps (Pa)
1
0
903
2
8,298
1153
3
16,596
1254
4
24,894
1078
5
33,191
652
6
41,489
0
Selection requirements
Confirm airflow, static pressure, inlet density, temperature, conveyed-air composition, arrangement, rotation and discharge position, drive type, voltage, control method, corrosion class, permissible sound level, access space and accessories before order.
Technical documents, dimensions and service
Technical documents and dimensions
Final dimensions, connection details, materials, motor data and project drawings are issued for the selected configuration after engineering review.
Installation and maintenance
Provide level support, flexible connections, guarded drive components, alignment checks and safe maintenance access. Follow the approved project-specific O&M document.
Selection tables and calculated curves on this page are preliminary engineering guidance, not certified RAFAVENT test ratings. Confirm the operating point and controlled documents before order.
Information required before selection
Required airflow and static pressure
Operating temperature and conveyed-air composition
Installation orientation, space and connection details
Electrical supply, control method and duty pattern
Sound, material and environmental constraints
Request an engineering selection
Send the duty point, installation arrangement, operating conditions and available drawings for a project-specific selection.
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