Technical documents and dimensions
Final dimensions, connection details, materials, motor data and project drawings are issued for the selected configuration after engineering review.
RAFAVENT CENTRIFUGAL FAN SUBFAMILY
Single-Inlet Forward-Curved Centrifugal Fans
SISW · SINGLE INLET · SINGLE WIDTH
Single-inlet, single-width (SISW) forward-curved centrifugal fans for model-specific ventilation duties.
Preliminary engineering selection dataRAFAVENT RF-CF-FWD SERIES
Single-Inlet Forward-Curved Centrifugal Fans — Technical Selection Data
Compact forward-curved centrifugal fans for cabinets, AHUs and low-to-medium pressure HVAC supply or extract duties.
RAFAVENT Engineering Calculation — Preliminary Selection — Non-Certified. Values are calculated at 20 °C and standard air density 1.20 kg/m³ using fan-law scaling and engineering assumptions. They are not laboratory-certified ratings. No efficiency claim is made. Final selection requires a confirmed duty point, inlet arrangement, motor loading review and approved production drawing.
Construction and application
- Formed steel scroll casing with single inlet and multi-blade forward-curved wheel; double-inlet execution requires separate engineering.
- Wheel balancing and vibration acceptance are required before dispatch.
- Direct or belt drive by arrangement. Confirm drive side, clockwise/counter-clockwise rotation and discharge position when viewed from the inlet.
- Motor table shows rated output, not absorbed electrical input. VFD use requires motor and minimum-speed confirmation.
- Preliminary clean-air ambient duty −20 to +50 °C. No ATEX, smoke, furnace or high-temperature certification is claimed.
- Standard model series Ø200–Ø800. Sizes 900–1000 are custom only after structural, shaft and motor review.
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-CF-FWD-200 | 200 | 1450 | 140–274 | 46–108 | 334 | 131 | 0.01 | 0.12 | 230/400 V 3Ph | 51 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-250 | 250 | 1450 | 274–535 | 72–168 | 652 | 205 | 0.03 | 0.12 | 230/400 V 3Ph | 51 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-315 | 315 | 1450 | 548–1,070 | 114–267 | 1,305 | 326 | 0.09 | 0.12 | 230/400 V 3Ph | 52 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-355 | 355 | 1450 | 785–1,532 | 145–340 | 1,868 | 414 | 0.17 | 0.25 | 230/400 V 3Ph | 54 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-400 | 400 | 1450 | 1,123–2,192 | 184–431 | 2,673 | 526 | 0.3 | 0.37 | 230/400 V 3Ph | 56 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-450 | 450 | 1450 | 1,598–3,120 | 233–546 | 3,805 | 665 | 0.54 | 0.75 | 230/400 V 3Ph | 58 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-500 | 500 | 1450 | 2,192–4,280 | 287–674 | 5,220 | 821 | 0.92 | 1.1 | 230/400 V 3Ph | 60 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-560 | 560 | 960 | 2,039–3,981 | 158–370 | 4,855 | 452 | 0.47 | 0.55 | 230/400 V 3Ph | 57 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-630 | 630 | 960 | 2,904–5,669 | 200–469 | 6,913 | 572 | 0.85 | 1.1 | 230/400 V 3Ph | 59 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-710 | 710 | 960 | 4,156–8,114 | 254–595 | 9,896 | 726 | 1.54 | 2.2 | 230/400 V 3Ph | 61 ±6 | Direct / belt by arrangement |
| RF-CF-FWD-800 | 800 | 720 | 4,459–8,706 | 181–425 | 10,617 | 518 | 1.18 | 1.5 | 230/400 V 3Ph | 59 ±6 | Direct / belt by arrangement |
Forward-curved fans can have rising motor demand toward open flow. Motor selection includes a preliminary 15% margin but final absorbed-power review across the operating range is mandatory. Estimated sound at 3 m has ±6 dB(A) uncertainty before casing, duct and system effects.
Calculated model curves
Open a model to view its six-point preliminary Q–Ps curve.
RF-CF-FWD-200 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 76 |
| 2 | 67 | 108 |
| 3 | 134 | 131 |
| 4 | 200 | 116 |
| 5 | 267 | 74 |
| 6 | 334 | 0 |
RF-CF-FWD-250 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 119 |
| 2 | 130 | 168 |
| 3 | 261 | 205 |
| 4 | 392 | 181 |
| 5 | 522 | 115 |
| 6 | 652 | 0 |
RF-CF-FWD-315 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 189 |
| 2 | 261 | 267 |
| 3 | 522 | 326 |
| 4 | 783 | 287 |
| 5 | 1,044 | 183 |
| 6 | 1,305 | 0 |
RF-CF-FWD-355 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 240 |
| 2 | 374 | 340 |
| 3 | 747 | 414 |
| 4 | 1,121 | 364 |
| 5 | 1,495 | 232 |
| 6 | 1,868 | 0 |
RF-CF-FWD-400 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 305 |
| 2 | 535 | 431 |
| 3 | 1,069 | 526 |
| 4 | 1,604 | 463 |
| 5 | 2,138 | 294 |
| 6 | 2,673 | 0 |
RF-CF-FWD-450 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 386 |
| 2 | 761 | 546 |
| 3 | 1,522 | 665 |
| 4 | 2,283 | 585 |
| 5 | 3,044 | 373 |
| 6 | 3,805 | 0 |
RF-CF-FWD-500 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 476 |
| 2 | 1,044 | 674 |
| 3 | 2,088 | 821 |
| 4 | 3,132 | 723 |
| 5 | 4,176 | 460 |
| 6 | 5,220 | 0 |
RF-CF-FWD-560 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 262 |
| 2 | 971 | 370 |
| 3 | 1,942 | 452 |
| 4 | 2,913 | 397 |
| 5 | 3,884 | 253 |
| 6 | 4,855 | 0 |
RF-CF-FWD-630 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 332 |
| 2 | 1,383 | 469 |
| 3 | 2,765 | 572 |
| 4 | 4,148 | 503 |
| 5 | 5,531 | 320 |
| 6 | 6,913 | 0 |
RF-CF-FWD-710 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 421 |
| 2 | 1,979 | 595 |
| 3 | 3,958 | 726 |
| 4 | 5,937 | 639 |
| 5 | 7,916 | 407 |
| 6 | 9,896 | 0 |
RF-CF-FWD-800 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 301 |
| 2 | 2,123 | 425 |
| 3 | 4,247 | 518 |
| 4 | 6,370 | 456 |
| 5 | 8,493 | 290 |
| 6 | 10,617 | 0 |
Selection requirements
Confirm airflow, static pressure, air density, temperature, inlet arrangement, drive side, rotation, discharge position, motor rated output, voltage/phase, VFD method, operating range, corrosion class, permissible sound level and access space before order.
Technical documents, dimensions and service
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