Blades width 100 or 165 mm; possibility of airtight construction according to EN 1751 (CL. 2 or Cl. 4); corrosion resistant; possible coupling and
Standard blades width 100 or 165 mm; min. flow resistance and noise; coupling and drive possibilities for all requirements. Available in all
A non-return valve (or louvre valve ) serves to kick back of wind and rain when the prevent the fan. Valve frame is made of aluminum profiles which