EE WAS CLEANING THE DASH OF A HUAL TRUCK FROM THE DRIVER'S SEAT AREA. HE REACHED AROUND THE COMPUTER DISPATCH PANEL AND HIS RIGHT HAND WENT INT HE FAR RIGHT AIR VENT. THE VENT WAS MISSING THE COVER AND AS HIS FINGERS WENT INTO THE VENT, HISRIGHT MIDDLE FINGER CONTACTED THE A/C FAN MOTOR BLADE AND HE RECEIVED A LACERATION TO THE FINGER.