Roof-AVS line is designed to extract large volumes of air, in roof installations. For instance: ventilation of big industrial plants, hangars, power plants etc. It consists of an outer casing, containing the gravity shutter, below which a Ring fan shall be fixed. The shutter opens thanks to the airflow generated by the fan and closes by gravity, preventing rain and wind entrance from outside and the dispersion of heat from inside.

This line consists of 6 sizes with impeller diameter from 560 up to 1000 mm.

The main characteristic of this line is the higher efficiency if compared with the axial roof fan with horizontal discharge, due to the lower resistance of the gravity shutter compared to the cap.

• Outer casing (AVS) with steel sheet panels including base, protected the atmospheric agents
  
• Gravity shutter with aluminum fans
  
• Outlet protection grid protected against the atmospheric agents
  
• Inlet nozzle
  
• Axial fan series Ring  protected against the atmospheric agents, impeller with airfoil profile blades, variable pitch angle in still position, in techno-polymer and hub in die cast aluminum alloy; asynchronous three-phase electric motor, protection IP55 Is. class F, service S1, construction according to IEC/EEC (UNEL MEC)
  
• Predisposition with loose cables for connection outside the roof-fan or internally in the building
  
• Arrangement 4 (directly coupled with impeller)