Fireline Sprinkler designs, fabricates, installs and maintains fire sprinkler systems for commercial, retail and industrial clients. It runs an in-house design team and a fabrication shop with robotic welding, and works with UA Local 669 crews to install projects in many states. The firm is based in Appleton, Wisconsin, and is registered with Washington L&I as a Fire Protection Systems specialty contractor (FIRELSL812N9).