Potsdam Fire was activated to an alarm activation at 0421 hours at Knowles Hall on the SUNY Potsdam Campus. Engine 49 (Fenton) was enroute at alarm time and on scene four minutes later. FF Fenton requested a second tone for manpower as residents were reporting smoke in the hallway. As additional personnel arrived on scene, members found that an exhaust vent for a bathroom had an overheated motor, causing the smoke condition in the building. Firefighters performed ventilated to clear the smoke from the building and restored the alarm. All units were back in service at 0514 hours.