World Leaders in Excellent Fan Technology. Originally established as a specialist fan supplier to the German merchant shipbuilding industry, Witt & Sohn have grown over the past 70 years to become one of the world's leading names in industrial fan technology and associated noise and vibration control. Witt & Sohn's well proven expertise in axial and centrifugal fan manufacture has today made them a market leader in many specialised, high performance sectors.
Smaller fan can be used for the same output due to higher efficiency = cheaper investment!
Smaller fan can be used for the same output due to higher efficiency = lower operation cost!
Customer can enjoy more cost saving from cheaper silencer and other fan-size related installation and accessories!
More than 80,000 projects references world-wide
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WITT & SOHN offer one of the most comprehensive industrial fan ranges of any manufacturer in the world. The selection charts overleaf, for both 50 and 60 cycles, show some of the range of axial and centifugal fans available with direct drive. The WITT & SOHN fan design approach offers multiple impellers for each fan type allowing the most economical arrangement to be confidently selected. Even if applications necessitate change, a different impeller can in most cases be used without having to change the whole fan.
Direct Drive: Virtually all possible working points with a volume flow rate from 100 m3/h up to 1,000,000 m3/h and pressure increases from 100 Pa up to 50,000 Pa can be offered with direct drive and the highest efficiency.
V-belt drives: For V-belt drive applications WITT & SOHN offer many alternatives as standard.
Other drives: Witt fans are also manufactured with drives via a coupling; or with pneumatic, hydraulic or water motors.
The continued exposure to applications with the highest performance requirements such as nuclear power plants, naval ships, chemical installations etc. has enabled WITT & SOHN to gain extensive experience with all kinds of materials.
Mild steel, aluminium and various speciality steels are used as standard, although more unusual materials such as titanium are increasingly being specified.
Offered as standard are a wide selection of outlet positions, casing geometries, casing thicknesses, materials and impellers for the various fan types.
• Air flowrate up to 2,000,000 m³/h
• Pressure up to 50,000 Pa
• Efficiency up to 89%
• Very low noise levels
• 500 impeller types for centrifugal fans
• 650 impeller types for axial fans
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The axial fans manufacturing by this company is used for tunnels, power plants, ships, oil and gas and etc. the main features of this fans are as follows:
Special Chrismas Tree® Blade Design, is proved to be the best axial fan blade which is not only more durable but also higher efficiency and energy saving than other blade designs.
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| Inlet size | 250 up to 2800 mm |
|---|---|
| Casing thickness | 1,5 up to 16 mm |
| Impeller types | N, M, X, Y (adjustable pitch) |
| Motor frame size | 63 up to 400 |
| Drive type | Coupling-, belt- or direct drive |
| Position | A, AU, AD, B, BD, BU according to Eurovent |
| Casing form | Short/long casing, swing out with/without shaped inlet |
| Surface treatment | Primer, finish, hot-dip galvanized, on request |
| Material | |
| - Impeller | Corrosion resistant cast aluminium |
| - Casing | Steel, aluminium, special alloys |
| Special design | Flame-proof, high temperature, shock proof, according to requirements |
A large selection of outlet positions, casing geometries, casing thicknesses and materials is available for the various fan types. The following is a description of the standard product range. A very flexible production allows special requirements to be met as well.
Our centrifugal fan range has been developed to allow most combinations of volume flow rate and pressure to be realised with direct drive fans. Since the fan range is based on a modular system the majority of fans can be manufactured from standard components. This allows for short through put times and competitive prices. Learn more!
| Inlet size | 63 up to 2500 mm |
|---|---|
| Casing thickness | 1,5 up to 20 mm |
| Casing types | RNN (Low pressure)
LRZ (Low pressure) PRZ (Medium pressure) MRZ (Medium pressure) HRZ (High pressure) SRZ (Ultra high pressure) |
| Impeller types | Minimum 6 types per casing including dust impellers |
| Motor frame size | 63 up to 450 |
| Drive type | Direct-, coupling− or belt drive |
| Material | Steel, aluminium, special alloys |
| Position | A, AU, AD, B, BD, BU according to Eurovent |
| Casing form | Short/long casing, swing out with/without shaped inlet |
| Surface treatment | Primer, finish, Hot dip galvanized, Special crating |
| Outlet position | according to Eurovent |
| Special design | Flame-proof, extreme temperature, gas-tight, decontaminable, corrosion resistant, earth quake safe, shock proof, according to requirements |
Since the early 1960's jet fans have been used to ventilate road tunnels with longitudinal ventilation. One of the earliest theoretical background papers was presented by a member of the Witt-Group of companies: "Jetfan Meidinger(1964)" Since then Witt&Sohn have equipped a large number of tunnels worldwide with jet and exhaust fans. The reference list only includes the current design of fans which was used in tunnels since 1987.
WITT&SOHN has developed the patented Banana Jet®. Depending on the tunnel characteristics the Banana Jet® generates 20-50% more effective thrust than a traditional jet fan of the same size. This jet fan reduces the costs for new tunnel ventilation systems and enables tunnel system upgrades (due to increased traffic load or new fire rules) without high costs.
A significant part of the airflow of a standard jet fan sticks to the ceiling and so the transferred impulse is significantly reduced. To take this effect into account several tunnel installation loss factors (Kempf-Factor etc.) have to be applied.
This problem has in the past been overcome by the use of Saccardo nozzles, where it was possible to blow air into the tunnel with a small angle downwards. As an extension of the Saccardo nozzle solution the Banana Jet® was developed to be used where Saccardo nozzles are not practical.
The Banana Jet® with the bent outlet airflow directs the impulse jet slightly towards the centre of the tunnel, therefore frictional losses due to swirls at the ceiling are negligible. So with the Banana Jet® tunnel installation loss factors such as the Kempf-Factor can be ignored in most of the cases. Learn more!
Fewer jet fans, lower investment costs for fans
Lower power consumption, lower investment costs for the electrical system, especially cabling.
If niches are required, then they can be smaller and shorter, lower civil construction costs.
Lower operational cost because of reduced power consumption and fewer fans to be maintained
Less turbulence of stratified smoke layer at the ceiling
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We offer a complete range of silencers and sound reduction equipment. The product programme is modular and can be adapted to suit most needs. It can be assembled quickly and to competitive prices. Dimension sheets and Insertion loss tables give an overview over the most often used silencer types. Learn more!
• More than 19,000 ships
• More than 1,000 Navy Vessels
• More than 100 Submarines
• More than 60,000 Industrial projects
• More than 800 Tunnels
• More than 100 Metro projects
• More than 70 Nuclear Power Plants
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