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Select technically compatible accessories for fans
Fan accessories connect the fan to the actual extraction or ventilation system and affect installation, airflow, noise, vibration, and maintainability. Components that fit mechanically are therefore not automatically suitable in terms of fluid dynamics or operational performance.
Typical accessory categories
✔ Connectors and adapters
✔ Flexible connections and expansion joints
✔ Protective grilles and intake components
✔ Silencers and acoustic components
✔ Vibration dampers and fasteners
✔ Dampers and control valves
✔ Installation and connection accessories
Effect on System Resistance
Many accessories affect the system’s pressure drop. Silencers, dampers, narrow passages, or additional elbows can reduce the available flow rate. When retrofitting, you should therefore check whether the existing fan still has sufficient pressure reserve.
| Accessories | Task | Points to note |
|---|---|---|
| Flex Connector | Vibration Isolation | Medium, Temperature, and Dimensions |
| silencer | Reduces airflow and fan noise | Take additional pressure loss into account |
| Flap | Shut-off or regulation of the airflow | Coordinate the operating point and control strategy |
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Here’s what you should look for in accessories
✔ Connection diameter and design
✔ Pressure loss in the additional component
✔ Medium and temperature
✔ mechanical and vibration-related stress
✔ Maintenance access and installation space
✔ Special safety or ATEX requirements
Vibration Isolation
Fans generate rotational forces and can transmit vibrations to piping systems or building structures. Flexible connections and appropriate vibration dampers can reduce this transmission, but must be suitable for the mechanical load.
Sound Attenuation
Silencers can reduce noise levels but increase system resistance. Therefore, the selection process should take both acoustic and fluid dynamics requirements into account.
Adapters and Connectors
Sharp or abrupt changes in cross-sectional area increase turbulence and pressure loss. Transitions should be designed to be as flow-friendly as possible and should fit into the existing piping network.
FAQ
Can accessories from different product lines be combined?
Only if the connection dimensions, mechanical load capacity, and technical function actually match.
Do accessories affect the flow rate?
Yes. Additional components can increase system resistance and thereby alter the actual operating point.
When is a flexible connection recommended?
When vibrations between the fan and the ductwork need to be reduced or minor installation movements need to be compensated for.
Why should a silencer be included in the calculation?
Because it causes an additional pressure drop that the fan must overcome.
Are protective grilles always required?
This depends on the installation situation and the hazards involved. Open intake or exhaust points must be safely assessed.
What should be considered for ATEX applications?
Accessories must also be compatible with the explosion protection concept and the suitability of the overall system.
Advice on Fan Accessories
The fan type, connection dimensions, medium, temperature, and desired function help ensure the correct selection. This allows you to choose accessories that are mechanically and aerodynamically compatible.
