Officials credit a sprinkler system for limiting the spread of an Appleton apartment fire. Crews were called to the units along the 400-block of North Richmond Street around 6:00 this morning on the report of a water flow alarm. They found that a fire had started in the vent hood of a microwave–but was put out by the sprinklers. The apartment was vacant at the time and was being cleaned out. No one was hurt. Damage is estimated at 60-thousand dollars.