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High-Temperature Fans for Industrial Use
High-temperature fans are used wherever air or process gases are significantly hotter than in standard ventilation applications. In addition to drying, furnace, and heating processes, this also applies to machine exhaust air, thermally stressed enclosures, and technical exhaust systems. The design must therefore take into account both fluid dynamics and thermal requirements.
Typical Applications
✔ Drying and oven processes
✔ Machine and process exhaust air
✔ Hot-air and recirculating air systems
✔ Production areas subject to thermal stress
✔ Technical exhaust air with elevated medium temperatures
What data determines the selection?
Flow rate, required pressure, medium temperature, and operating duration are critical factors in the technical selection process. Additional considerations include ambient temperature, particle load, installation orientation, connection geometry, and whether the fan is subject to continuous or intermittent thermal stress. The maximum permissible temperature should always be specified for the specific model.
| Criterion | Meaning | Planning Note |
|---|---|---|
| Temperature | Specifies material and storage requirements | Distinguish between sustained and peak temperatures |
| flow rate | Air flow rate | Evaluate at the actual operating point |
| Pressure loss | System resistance | Take into account piping systems, dampers, and filters |
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Here’s what you should look for when making your selection
✔ Maximum and sustained media temperature
✔ Required flow rate at the operating point
✔ Total pressure drop of the system
✔ Medium and potential particle load
✔ Installation orientation and thermal decoupling
✔ Maintenance Access and Operating Procedures
Temperature and Material Selection
As temperature rises, the demands placed on the housing, impeller, bearings, seals, and motor assembly change. Therefore, a maximum permissible temperature cannot be applied across the board to every design. Thermal expansion and heat transfer to adjacent components may also be relevant.
Fan performance curve and system performance curve
The actual flow rate achieved results from the interaction between the fan performance curve and system resistance. A high free flow rate is therefore not a sufficient selection criterion. The decisive factor is the pressure the fan can deliver at the required flow rate.
Maintenance and Installation Conditions
For systems subject to thermal stress, bearing locations, fasteners, and adjacent components should be inspected regularly. Good accessibility facilitates maintenance and reduces downtime. In addition, the system should be positioned so that heat can be safely dissipated.
FAQ
What distinguishes a high-temperature fan from a standard fan?
In particular, the design of the housing, impeller, bearings, and, where applicable, motor arrangement, which is suitable for elevated temperatures.
Is specifying the maximum temperature sufficient?
No. The duration, frequency, and environment of the thermal stress must also be taken into account.
Can a high-temperature fan handle air containing dust?
Only if the specific model is suitable for this purpose. Particle type and abrasiveness must be evaluated separately.
Why is pressure loss important?
Because the fan can only achieve the desired flow rate if it can overcome the resistance of the connected system.
When must ATEX be taken into account?
If explosive atmospheres may occur, the entire application must be evaluated accordingly.
What information helps with the selection process?
Flow rate, pressure drop, medium temperature, operating time, medium, and installation conditions are the most important input data.
Consulting on High-Temperature Fans
To ensure a reliable preliminary selection, we need information on the temperature range, air flow rate, pressure drop, medium, and installation conditions. This allows us to determine the appropriate design in terms of thermal and fluid dynamics.
