WHILE OPENING A VENTILATION DOOR FOR THE B DOMESTIC WATER BUILDING, THE DOOR CAME OFF WHEN THE HINGES BROKE. HE STEPPED BACK WHEN HE TRIED TO OPEN THE DOOR AND HE LOST HIS BALANCE AND FELL AGAINST A 6"" PIPE BRUISING HIS LEFT SIDE. THE X-RAY INDICATED 3 FRACTURED RIBS.