S4C WIND TUNNEL
The S4 wind tunnel has been specifically designed and built for the calibration of anemometers. The flow in the test section and the procedures followed by the LAC/IDR meet all the requirements of ENAC, MEASNET e IECRE. It has been in operation since 2003 and has calibrated more than 30.000 anemometers.

It is a open-circuit, closed-chamber, current-blown wind tunnel. Its main features are:
- Test chamber:
- Square section of 0.9 m on each side.
- Length 1.2 m.
- Maximum speed 30 m/s
- Turbulence intensity <0.1%.
- Uniformity >0.1%.
- Equipped with 4 fans
- Total electric power 30 kW
