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Roof Fans for Industrial Exhaust Systems
Roof fans enable compact exhaust air extraction through the building roof and are frequently used when machine, room, or process exhaust air needs to be vented directly to the outside. Installing them outside the actual work area can save space and facilitate integration into existing duct networks.
Typical Applications
✔ Workshop and facility exhaust air
✔ Machine and process exhaust air
✔ Technical Rooms and Production Areas
✔ Roof-mounted exhaust systems
✔ Integration with duct networks and detection systems
Design based on actual operating conditions
As with any fan selection, flow rate and pressure must be considered together. The roof fan must overcome the resistance of ducts, elbows, dampers, silencers, hoods, and, if applicable, filters. A maximum flow rate without specifying the available pressure is not sufficient for the design.
| Criterion | Meaning | Planning Note |
|---|---|---|
| flow rate | Required exhaust air volume | Design based on usage and data collection |
| Overcoming Channel Resistance | Include the entire pipeline route | |
| Roof connection | Mechanical Integration | Consider roof construction, waterproofing, and maintenance |
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Here’s what you should look for when making your selection
✔ Required flow rate at the operating point
✔ Pressure loss in the duct network and fittings
✔ Medium, temperature, and particle load
✔ Roof structure and connection dimensions
✔ Weather protection and secure mounting
✔ Noise levels and maintenance access
Roof Construction and Installation
The roof installation must be mechanically secure and permanently airtight. In addition to connection dimensions, roof pitch, structure, waterproofing, vibration transmission, and maintenance access must be taken into account. For larger units, the load-bearing capacity of the substructure may also be relevant.
Noise and Vibration
Roof fans can transmit structure-borne noise into the building structure. Appropriate mounting, vibration isolation, and, if necessary, sound attenuation can therefore be important components of the design process.
Medium and Specific Requirements
Not every roof fan model is suitable for dusty, corrosive, hot, or explosive media. The application must therefore be evaluated technically in advance.
FAQ
What are roof fans used for?
Primarily for exhaust air extraction from halls, machine areas, technical rooms, and industrial processes.
Can I select a roof fan based solely on flow rate?
No. The required pressure at this flow rate is just as important.
What factors influence system resistance?
Duct sections, elbows, dampers, silencers, filters, and capture elements.
Is every roof fan suitable for dust-laden exhaust air?
No. The design must be suitable for the particle and media load.
What is particularly important during installation?
Sturdy mounting, secure sealing, weather protection, and easy access for maintenance.
When is ATEX relevant?
If explosive atmospheres may occur, a suitable design must be selected and the entire system must be evaluated.
Advice on Roof Fans
Flow rate, pressure drop, duct routing, medium, temperature, and the structural configuration of the roof are particularly important for selection.
