Fan Systems Centrifugal Fans
Our
Range
Offering seven main fan type families (R, L, P, M, H, S ,T) with an abundance of options and modifications to cover all your air movement needs. Each one available in all our given configurations. We pride ourselves in our versatile capabilities where our fan ranges are perfect for both basic requirements or bespoke products built for in depth specifications and special demands. All built for reliability, robustness and long life.
- Volumes up to 500,000 m3/hr
- Pressures up to 50,000Pa
- Efficiencies up to 88%
- Motor frame size: 90 up to 400
- Casing thickness: 3mm up to 20mm
- Inlet size: 90mm up to 1800mm
- Process Temperatures: -40C - + 600C
- Materials of Construction : Mild Steel, Stainless Steel 304L/316L/Duplex, Hardox, Naxtra, Aluminium and special alloys.
- Atex: Zone 1, 21 and 2, 22.
- Standard and Special Coatings: Powder Coat, Wet Spray, Galvanized, C5 Paint Systems, Rubber lined and other specialist lining’s
Direct
Mounted
Our direct mounted centrifugal fan is a compact, high-efficiency air-moving solution designed for reliable performance in industrial, commercial, and HVAC applications. In this configuration, the fan impeller is mounted directly onto the motor shaft, eliminating the need for belts or couplings. This direct-drive design enhances efficiency, reduces maintenance requirements, and ensures smooth, low vibration operation. It can be used for process air temperatures of up to 250C continuously.
Coupling
Driven
More often used for larger fans and high temperatures, this configuration separates the motor from the impeller. The motor is connected via various styles of flexible or rigid couplings driving through a shaft and bearings connected to the impeller. It therefore allows continuous operation of up to 600C. Offering ease of maintenance and motor change.
Belt
Driven
Also often used for larger fans and high temperatures, this configuration separates the motor from the impeller. The motor is connected via a belt and pulley system driving through a shaft and bearings connected to the impeller. It therefore allows continuous operation of up to 600C. Offering ease of maintenance and motor change. This drive type offers versatile speed selections which can enhance efficiency and offer more fan type options.
DIDW
Fan
A DIDW fan (Double Inlet Double Width centrifugal fan) is a high-capacity air-moving solution designed to deliver large volumes of airflow at medium to low pressure. This configuration features two inlets positioned on both sides of the impeller and a wider wheel, allowing air to enter from both ends simultaneously for increased efficiency and balanced operation. DIDW fans are widely used in HVAC and air handling systems where consistent, high-volume airflow is required. Most often offered in our R type range and in both belt or coupling arrangement.
Inlet
Mounted
Inlet mounted fans utilize a B5 flange mounted motor mitigating the need for a pedestal. The fan is mounted via a reinforced inlet spigot flange. Offering a compact and cost-effective design with ease of installation.. They are most commonly used in the dust and filtration industry.
Plenum
Fan
A plenum centrifugal fan is a type of centrifugal (radial) fan designed to operate without a traditional scroll housing, discharging air directly into a pressurized space called a plenum (a sealed air chamber used in HVAC systems). Offering compact design and ease of maintenance.
Plug
Fan
Plug fans are designed for integration directly within systems such as industrial ovens, high-temperature processes, and plenum chambers. Their compact, versatile design makes them ideal for applications where space, performance, and reliability are critical.
Depending on your specific requirements, we offer configurations with or without a scroll casing, as well as both direct-drive and belt-driven options. Each solution is tailored to ensure optimal performance within your system environment.
Double
Stage
Double stage fans are engineered for very high-pressure applications where a single-stage unit is not sufficient. The first fan discharges through a short duct section into the inlet of the second fan, effectively increasing the overall pressure output to nearly double that of a standard configuration.
Available in both direct-drive and belt-driven arrangements, these fans are built for strength and durability. Featuring wrap-around stiffeners and reinforced pedestals, the design provides exceptional structural integrity, ensuring reliable performance in demanding industrial environments.
Frequently
Asked Questions
What makes WITT centrifugal fans different from competitors?
Our modular design system sets us apart—offering 6-10 different impeller options per casing size. This unique approach provides exceptional flexibility for performance optimisation and future system modifications. Combined with our 88% peak efficiency ratings and comprehensive in-house manufacturing capabilities, we deliver superior total cost of ownership compared to conventional designs.
Which industries typically use centrifugal fans?
Centrifugal fans serve diverse sectors including power generation, chemical processing, HVAC systems, marine applications, cement plants, steel mills, and wastewater treatment facilities. Their ability to generate high pressures makes them ideal for systems with significant resistance such as long ductwork, filtration systems, scrubbers, and material handling applications.
What's the difference between centrifugal and axial fans?
Centrifugal fans change airflow direction by 90 degrees, using centrifugal force to generate pressure—ideal for high-resistance systems requiring pressures up to 50,000 Pa. Axial fans move air parallel to the shaft axis, better suited for high-volume, lower-pressure applications. Centrifugal designs typically offer higher pressure capabilities and better performance in dusty environments.
Can centrifugal fans handle particulate-laden air?
Yes, we manufacture specialised impeller designs (types LQZ11, VPZ) specifically for dust-laden and material handling applications. These feature radial or paddle blades that resist material build-up, reinforced construction for impact resistance, and wear-resistant materials or coatings. Access doors and clean-out provisions facilitate maintenance in challenging applications.
What drive arrangements are available?
We offer direct drive (motor mounted directly to fan shaft), belt drive (allowing speed variation and motor isolation), and coupling drive (for high-power applications). Each arrangement has specific advantages: direct drive minimises maintenance, belt drive provides speed flexibility, and coupling drive handles high torques whilst allowing precise alignment.
How do I select the right centrifugal fan for my application?
Selection depends on airflow requirement, system resistance, temperature, altitude, and gas composition. Our engineering team uses advanced selection software considering these factors plus noise requirements, space constraints, and efficiency targets. We provide detailed performance curves, acoustic data, and dimensional drawings to ensure optimal selection for your specific application.