Wind Shear's tunnel is a closed air circuit, temperature-controlled system built around a rolling road.
Air temperature, critical to repeatable data collection, is maintained at a constant 75 °F (24 °C), plus or minus one degree.
Air is moved through the massive 15,000 sq ft (1,400 m2) air circuit at the maximum rate of 47,500 cu ft (1,350 m3) per second by a 5,100 hp (3,800 kW) motor and 29 carbon fiber blades 22 feet (6.7 m) in diameter.
An example of this, the blockage effect, is the condition where air flow in the wind tunnel is partially blocked by the vehicle.
The blockage becomes more critical as the cross section of the test vehicle increases relative to the size of nozzle and airstream.