Visitors to the shop floor at AirPro Fan in Rhinelander are greeted by a wall of sound and activity. Forklifts dart here and there, welders send sparks flying, and industrial fans are moved from one place to another by ceiling-mounted lifts. “What you’re going to see is all sorts of things going on, welding, machining, all sorts of things,” said AirPro’s Lori Miller on a recent tour. One worker was slathering thick grease on a fan, applying the finishing touches. “Just greasing the coupling,