RAFAVENT CENTRIFUGAL FAN SUBFAMILY

Backward-Curved Single-Inlet Centrifugal Fans

Single-inlet centrifugal arrangement with backward-curved impeller, documented by the selected model.

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.