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Fans as the Drive for Industrial Extraction Systems
Fans generate the required airflow to overcome the resistance of ductwork, filters, capture elements, and other system components. To make a reliable selection, the flow rate and available pressure at the actual operating point must be considered together.
Typical fan assemblies
✔ Centrifugal fans for duct and filter systems
✔ Transport fans for air containing particles
✔ High-temperature fans for thermally demanding processes
✔ Roof fans for exhaust air applications
✔ ATEX-compliant versions for appropriately classified areas
✔ Accessories and configuration options
The operating point is decisive
The actual flow rate achieved is determined by the intersection of the fan characteristic curve and the system characteristic curve. A high maximum free-blow value therefore says little about the amount of air available in a real piping and filtration system.
Medium and Operating Conditions
Dust, chips, temperature, humidity, and potentially corrosive or explosive media affect the suitability of the design. Not every fan is suitable for handling air containing particles or extremely hot air.
Here’s what you should look for when making your selection
✔ Required flow rate at the actual operating point
✔ Total pressure drop of the system
✔ Medium, particles, and temperature
✔ Motor Power and Operating Mode
✔ Noise and installation conditions
✔ Connection dimensions and maintenance access
✔ Special safety or ATEX requirements
FAQ
Is specifying the flow rate sufficient for selection?
No. Additionally, it must be known what pressure the fan can provide at this flow rate.
What causes pressure losses?
These include, among other things, pipe lengths, elbows, changes in cross-section, filters, and capture elements.
When is a centrifugal fan a good choice?
When a system must overcome higher resistance caused by piping or filters.
When is frequency control appropriate?
For varying air demand or different operating conditions.
Consulting on Fan Sizing
Desired flow rate, pressure drop, piping network, filters, medium, and operating conditions are the most important design parameters.
