3. Arrangements of centrifugal fans
Direct Driven
| Arrangement 4 | Arrangement 5 | Arrangement 8 |
 |  |  |
| The impeller is mounted directly on the motor shaft Motor is placed on a support chair | The impeller is mounted directly on the motor shaft. Motor B5 mounted with its flange without chair support for the motor | The impeller is mounted on a shaft between bearings. Motor and shaft are linked by a semi-elastic coupling. |
Belt Driven
| Arrangement 9 | Arrangement 11 | Arrangement 12 |
 |  |  |
| The impeller is mounted on a shaft between bearings. The motor is mounted on the side of the support chair. The transmission is and provided by pullies belts. | Fan with DOUBLE SUCTION The impeller is mounted on a shaft between bearings. The motor is mounted on a common base. The transmission is provided by pullies and belts. | The impeller is mounted on a shaft between. The motor is mounted on a common base The transmission is provided by pullies belts. |