2. Normalized orientations of fans
Standardized guideline fans
Position control engine belts
Arrangements centrifugal fans
Direct driven
| Arrangement | Arrangement | Arrangement |
| 4 | 5 | 8 |
 |  |  |
| The turbine is directly assembled on the driving shaft end. Engine is posed on chair support | The turbine is directly assembled on the driving shaft end. B5 engine assembled with its support without chair support | The turbine is assembled to a shaft between two stages. A semi flexible coupling between shaft and engine |
Driven by V-belts
| Arrangement | Arrangement | Arrangement |
| 9 | 11 | 12 |
 |  |  |
| The turbine is assembled on an axis between stages. The engine is assembled on side of the chair support stages. The transmission is ensured by pulleys and belts. | Double inlet centrifugal fan. The engine is assembled on a common frame. The transmission is ensured by pulleys and belts. | The turbine is assembled on a shaft between stages. The engine is assembled on a common frame. The transmission is ensured by pulleys and belts. |