Witt&Sohn − Products

By: Witt&sohn  06-Dec-2011
Keywords: Fan, Centrifugal Fans

comprehensive ranges

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.

Standard specifications

Offered as standard are a wide selection of outlet positions, casing geometries, casing thicknesses, materials and impellers for the various fan types.


Inlet sizes 250 to 2800 mm.
Casing thickness 1,5 to 16mm.
Impeller types N, M, X, Y (adj.pitch).
Motor frame sizes 63 to 400.
Drive types Direct, V-belt or coupling.
Positions A,AU,AD,B,BD,BU (Eurovent).
Casing designs Short/long casing, swing out, w/wo shaped inlet.
Surface treatment Primer; finish; hot-dip galvanised, as required.
Materials - Impellers Corrosion resistant cast aluminium.
Materials - Casings Steel, aluminium, special alloys.
Special designs Flame-proof; shock-proof; earth-quake proof; high temperature, as required.


Inlet sizes 63 to 2500 mm.
Casing thickness 1,5 to 20 mm.
Casing pressure types RNN & LRZ (Low pressure). PRZ & MRZ (Medium pressure). HRZ (High pressure). SRZ (Ultra-high pressure).
Impeller types Min. 6 types per casing incl. dust impellers.
Motor frame sizes 63 to 450.
Drive types Direct, V-belt or coupling.
Materials Steel; aluminium; stainless steel; titanium; spec. alloys.
Surface treatment As axial flow fan.
Outlet positions To Eurovent.
Special designs Flame-proof; shock-proof; extreme temperature; gas-tight; rubberised; decontaminable; earth-quake proof; corrosion resistant, as required.


  • shaped inlets
  • fire dampers
  • protection grills
  • mushroom cowls
  • vibration attenuators
  • jet cowls
  • flexible connections
  • counter flanges
  • silencers
  • variable inlet vanes
  • inlet/outlet dampers
  • acoustic enclosures
  • insulations
  • monitoring instrumentation

Keywords: Centrifugal Fans, Fan

Other products and services from Witt&sohn


Witt&Sohn − Produkte

Durch die Konstruktionsphilosophie von WITT&SOHN, für jeden Ventilatortyp Laufräder unterschiedlicher Charakteristik bereitzuhalten, wird erreicht, daß die wirtschaftlichste Bauform ausgewählt werden kann. Fast alle möglichen Arbeitspunkte mit einem Volumenstrom von 100m3/h bis zu 1.000.000m3/h und Druckerhöhungen von 100 Pa bis zu 50.000 Pa können mit Direktantrieb bei hohen Wirkungsgraden erzielt werden.