A SMALL ENCLOSURE SURROUNDING A BLOWER FOR A PNEUMATIC CONVEYING SYSTEM CAUGHT FIRE. THE STRUCTURE WAS A METAL SIDING, WOODEN FRAME BUILDING WITH PLYWOOD WALLS. THE SOURCE OF THE FIRE IS UNKNO WN. THE FIRE WAS PUT OUT WITH THE PLANT WATER TRUCK. THE LOCAL FIRE DEPARTMENT WAS CALLED IN. NO ONE WAS INJURED.