Ducts and fittings

For applications in industrial aeration and ventilation  (plant engineering, office buildings, residential buildings), we supply a broad range of round or angled ventilation ducts of all common nominal diameters.
These products are made from roll-galvanised sheet steel. Stainless steel ducts and pipes are used where special requirements need to be met. Stainless steel ventilation facilities are used whenever aggressive media need to be purged, if higher temperature resistance is required or where aesthetic aspects need to be taken into consideration. 
HYDRA® ducts and fittings are characterised not only by their chemical inertness and thermal resistance, but also by the good processing features, very long service life, and high tightness. 


  • Ducts and fittings made of galvanised steel or stainless steel
  • Spiral ducts, longitudinally slip-jointed and welded pipes
  • Fittings (connectors, bends, branched parts, transition parts, etc.)
  • Insulated pipes and fittings
  • Flex pipes
  • Silencers
  • Attachments


Witzenmann Metal Products Mexico

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