Ventiflex Tunnel Ventilation Calculator

Ventiflex Tunnelcalc is a simple tool, to determine the recommended duct-diameter, with additional information of approximately fan-size and working air pressure. This calculator is based on SIA recommendations, and the latest European norms, for tunnel ventilation.

Basically are there three key-figures necessary to operate this calculator: (To be entered into the light green fields)

  • The tunnel cross-section
  • The tunnel length ( duct-length )
  • SIA Class ( S-Class for TBM or A-Class for D&B )

Other figures will automatically appear, based on these three figures, and indicate recommended duct diameter.