EMPLOYEE WAS ASSISTING FELLOW MAINTENANCE MAN REPAIR HOPPER SCREW INSIDE KILN #1 BAGHOUSE SCREW COMPARTMENT. STANDING OUTSIDE OF COMPARTMENT AT ACCESS DOOR PASSING TOOLS/PART, CKD FROM AREA BE ING PULLED INTO THE COMPARTMENT BY ID FAN WENT INTO HIS RIGHT EYE. SAFTEY GLASSES WERE ON.