Wind tunnels, used for aerodynamic and acoustic testing in the automotive and aerospace industries, use one or more electrically driven fans to push or pull air through a test section. Air will either recirculate through a closed loop or be drawn in from the surroundings from one end of the tunnel and exhausted out the opposite end.
Around the wind tunnel, there are several full body access doors to allow for maintenance. It is critical to ensure no one enters the tunnel while in operation. Incorporating a trapped key interlock system ensures the proper sequence of energy isolation is performed and personnel remain safe.
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