Technical documents and dimensions
Final dimensions, connection details, materials, motor data and project drawings are issued for the selected configuration after engineering review.
RAFAVENT INLINE & ACOUSTIC SUBFAMILY
Inline Duct Fan Units
Fan units designed for direct integration into circular or rectangular duct routes.
Preliminary engineering dataRAFAVENT RF-ID-MF SERIES
Inline Mixed-Flow Duct Fan Units — Technical Selection Data
Compact direct-driven mixed-flow units for circular duct supply and extract duties.
RAFAVENT Engineering Calculation — Preliminary Selection — Non-Certified. Values are calculated at 20 °C and air density 1.20 kg/m³ using fan-law scaling and engineering assumptions. They are not laboratory-certified ratings. Final selection requires confirmed system resistance, duct arrangement, motor control and approved production drawing.
Construction and application
- Galvanized or coated steel cylindrical casing, mixed-flow impeller, downstream guide vanes and direct drive.
- Removable service section and external terminal box; provide safe access without loading the adjacent duct.
- Flexible connectors and independent supports are recommended. Any-orientation installation requires verified support, drainage and terminal-box access.
- Single-phase basis through Ø315; three-phase basis from Ø350. EC execution is an engineered option, not a general claim.
- Preliminary clean-air duty −20 to +50 °C. Not for grease, abrasive dust, smoke control, ATEX or certified high-temperature duty unless separately documented.
- Standard impeller series Ø200, Ø250, Ø280, Ø315, Ø350, Ø400, Ø450 and Ø500.
Model selection table
| Model | Impeller Ø mm | rpm | Recommended Q m³/h | Recommended Ps Pa | Calculated max Q | Calculated shutoff Ps | Est. shaft kW | Preliminary motor selection kW | Supply | Est. LpA @3m dB(A) | Arrangement |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RF-ID-MF-200 | 200 | 2800 | 235–551 | 104–290 | 672 | 371 | 0.05 | 0.12 | 230 V 1Ph | 52 ±6 | Direct mixed-flow |
| RF-ID-MF-250 | 250 | 2800 | 459–1,076 | 162–453 | 1,312 | 580 | 0.15 | 0.18 | 230 V 1Ph | 56 ±6 | Direct mixed-flow |
| RF-ID-MF-280 | 280 | 2800 | 645–1,512 | 204–568 | 1,844 | 728 | 0.26 | 0.37 | 230 V 1Ph | 58 ±6 | Direct mixed-flow |
| RF-ID-MF-315 | 315 | 2800 | 919–2,153 | 258–719 | 2,625 | 921 | 0.47 | 0.55 | 230 V 1Ph | 60 ±6 | Direct mixed-flow |
| RF-ID-MF-350 | 350 | 1450 | 653–1,529 | 85–238 | 1,865 | 305 | 0.11 | 0.18 | 230/400 V 3Ph | 53 ±6 | Direct mixed-flow |
| RF-ID-MF-400 | 400 | 1450 | 974–2,283 | 112–311 | 2,784 | 398 | 0.22 | 0.25 | 230/400 V 3Ph | 55 ±6 | Direct mixed-flow |
| RF-ID-MF-450 | 450 | 1450 | 1,387–3,250 | 141–393 | 3,964 | 504 | 0.39 | 0.55 | 230/400 V 3Ph | 58 ±6 | Direct mixed-flow |
| RF-ID-MF-500 | 500 | 1450 | 1,903–4,459 | 174–486 | 5,438 | 623 | 0.66 | 1.1 | 230/400 V 3Ph | 59 ±6 | Direct mixed-flow |
Selected motor includes a preliminary 15% margin. Estimated sound at 3 m has ±6 dB(A) uncertainty before duct, attenuation, room and installation effects.
Calculated model curves
Open a model to view its six-point preliminary Q–Ps curve.
RF-ID-MF-200 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 371 |
| 2 | 134 | 364 |
| 3 | 269 | 334 |
| 4 | 403 | 279 |
| 5 | 538 | 186 |
| 6 | 672 | 0 |
RF-ID-MF-250 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 580 |
| 2 | 262 | 569 |
| 3 | 525 | 522 |
| 4 | 788 | 435 |
| 5 | 1,050 | 290 |
| 6 | 1,312 | 0 |
RF-ID-MF-280 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 728 |
| 2 | 369 | 713 |
| 3 | 738 | 655 |
| 4 | 1,106 | 546 |
| 5 | 1,475 | 364 |
| 6 | 1,844 | 0 |
RF-ID-MF-315 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 921 |
| 2 | 525 | 903 |
| 3 | 1,050 | 829 |
| 4 | 1,575 | 691 |
| 5 | 2,100 | 461 |
| 6 | 2,625 | 0 |
RF-ID-MF-350 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 305 |
| 2 | 373 | 299 |
| 3 | 746 | 275 |
| 4 | 1,119 | 229 |
| 5 | 1,492 | 153 |
| 6 | 1,865 | 0 |
RF-ID-MF-400 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 398 |
| 2 | 557 | 390 |
| 3 | 1,114 | 359 |
| 4 | 1,670 | 299 |
| 5 | 2,227 | 199 |
| 6 | 2,784 | 0 |
RF-ID-MF-450 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 504 |
| 2 | 793 | 494 |
| 3 | 1,586 | 454 |
| 4 | 2,378 | 378 |
| 5 | 3,171 | 252 |
| 6 | 3,964 | 0 |
RF-ID-MF-500 — calculated Q–Ps curve
Airflow Q (m³/h)Static pressure Ps (Pa)
| Point | Q (m³/h) | Ps (Pa) |
|---|---|---|
| 1 | 0 | 623 |
| 2 | 1,088 | 610 |
| 3 | 2,175 | 560 |
| 4 | 3,262 | 467 |
| 5 | 4,350 | 311 |
| 6 | 5,438 | 0 |
Selection requirements
Confirm airflow, static pressure, air density, temperature, duct diameter, upstream and downstream straight length, mounting orientation, service access, voltage/phase, speed-control method, operating range, permissible sound level and conveyed-air composition 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