THERE WAS NO INJURY. MSHA CONTACTED AT 7:30 AM AND INSPECTOR PERFORMED AN INVESTIGATION ALONG WITH STATE INSPECTOR. THE CO. CORPORATE ENGINEER WAS ALSO INVOLVED IN THE INVESTIGATION. THE #2 CO AL FAN EXPLODED THROWING DEBRIS 15 FT. FROM THE HOUSING. FAN ITSELF REMAINED INTACT BUT THE HOUSING WAS DAMAGED BEYOND REPAIR. FULL INVESTIGATION IS TAKING PLACE & FULL REPORT WILL GO TO MSHA