| Pressure recovery |
Look for opportunities for pressure recovery at centrifugal exhaust fan outlets. |
| Don't |
 |
| To determine the system resistance the discharge losses have to be added before selecting the fan. |
| Discharge losses are highest in this arrangement and are equivalent to one velocity head. |
| Do |
 |
| With a correctly designed discharge diffuser the pressure recovery in the diffuser will reduce the system total pressure. |
| Included angle of diffuser to be 15º or less. |
| Discharge losses reduced by up to 75% in this arrangement. |
| Look for opportunities for static pressure recovery at axial exhaust fan outlets. |
| Don't |
 |
| To determine the system resistance the discharge losses have to be added before selecting the fan. |
| Discharge losses are highest in this arrangement and are equivalent to one velocity head. |
| Do |
 |
| With a correctly designed discharge diffuser the pressure recovery in the diffuser will reduce the system total pressure. |
| Included angle of diffuser to be 15º or less. |
| Discharge losses reduced substantially in this arrangement. |
Propriety information courtesy of FANTECH (Australia) |
(NOT TO BE REPRODUCED) |