Manufacturing, Manufacturing Plant Lexington, KY – 3 a.m. fire at manufacturing plant knocked down by sprinkler system March 9, 2015 viking210 Sprinklers stopped a fire from spreading at a plant in Lexington. The fire started just after 3 a.m. Monday at Interplex Plastics on Brentwood Court. Firefighters say when they arrived, the fire was already knocked down by the sprinkler system in the plant. No one was in the plant at the time of the fire. An arson investigator was called to the scene. No word yet on a possible cause.