
Welcome to Siempelkamp Industrial Fans GmbH, your competent full-service partner for high-efficiency process air solutions. As an internationally active premium manufacturer, we develop and manufacture customized industrial centrifugal fans, industrial dampers and the entire associated periphery – for the highest demands and in uncompromising quality Made in Germany.
With more than 50 years of experience in the market – having emerged from the renowned Ventapp GmbH – we combine proven engineering tradition with state-of-the-art manufacturing technology. On more than 10,000 m² of production space at our location in Germany, we realize system solutions that set global standards in terms of durability and efficiency.
Whether for the chemical, metallurgical, building materials industries or environmental technology: Siempelkamp Industrial Fans stands for energy-efficient plant components that work reliably even under the harshest conditions – including ATEX-compliant designs. Trust in a partner who not only delivers products but sustainably optimizes your processes.

Industrial Fans
These centrifugal fans function as the heart of industrial process air systems and are precisely tailored to specific operating parameters. The design covers extreme performance ranges, from high-pressure applications to cryogenic or high-temperature processes. The robust construction guarantees extraordinary longevity and maximum smooth running in continuous operation.
- Pressure: over 25,000 Pa
- Temperature range: -180 °C to +900 °C
- Impeller diameter: up to 4,000 mm
- Peripheral speed: up to 250 m/s
- Special features: Gas-tight and pressure-resistant design, high efficiency, high smooth running, ATEX-compliant design, various configurations

Industrial Dampers & Slide Gates
These components serve the precise control and safe shut-off of gas flows in industrial plants. Manufacturing is carried out in round or rectangular designs and is engineered for the highest mechanical and thermal loads.
- Dimensions: Round up to Ø 4.5 m / Rectangular up to 3 m x 8 m
- Temperature range: -100 °C to +1,200 °C
- Designs: Inlet vane controls, double pendulum flaps, butterfly dampers, 3-way bypass dampers, multi-leaf dampers, slide gates, tandem dampers, double shut-off dampers
- Seals: Blade seals: metallic, metallic flexible and soft-sealing, as well as various shaft seals
- Actuation technology: Actuators and control drives in pneumatic and electric versions, worm gears and manual levers, multi-locking
- Safety: Internal and external limit switches
Complete system solutions

84
Employees
10.000 m²
Production area
ISO 3834-2 & AD 2000
Certified welding company
95 %
Delivery reliability
Complete solutions from a single source
From the initial on-site evaluation through 3D design (CFD/FEM) to global installation and commissioning, you receive all services from a single source at Siempelkamp Industrial Fans.
On-site evaluation
We analyze your requirements directly at your plant to create the optimal basis for a customized solution. Our experts record all relevant operating parameters precisely on site.
Planning & Development
Based on the analysis, we develop innovative concepts that guarantee maximum energy efficiency and process reliability. We plan every detail of your air technology system individually and in a forward-looking manner.
Project Management
An experienced project manager accompanies your project from the initial idea to final acceptance to ensure a smooth process. We coordinate all interfaces and ensure the on-time implementation of your projects.
3D Design
Using state-of-the-art 3D CAD software as well as CFD and FEM analyses, we visualize and validate your system components. This guarantees maximum accuracy of fit and structural integrity before the start of production.
Manufacturing
Production is carried out according to the highest quality standards and certified welding processes directly in our own production halls. We implement your requirements with craftsmanship precision and modern laser technology.
Delivery (worldwide)
Thanks to our high delivery reliability of 95%, we bring your components safely and on schedule to any site worldwide. We handle the complete logistics processing for your smooth plant operation.
Repair, Service & Maintenance
Our full service includes lifelong support, maintenance, and optimization of your fans – also for third-party brands. We minimize downtimes through preventive maintenance and fast spare parts availability.
We would be pleased to advise you!
Rely on Quality Made in Germany and personalized support. Our team looks forward to answering your questions and to planning the optimal component for your process together with you.
Our Full-Service Portfolio for Process Air
From high-performance industrial fans to precise damper systems and noise protection solutions – we offer you a comprehensive range of premium components in Quality Made in Germany. Discover our technologically advanced products and customized services, specifically developed for the extreme requirements of modern industrial plants.
Industry Solutions
We develop high-performance and efficient system solutions for almost every industrial requirement.