Where fitted, latches and knobs which have an integral locking and/or latch mechanism must be CERTIFIRE Approved. An integral part of the all-new Perry Shield range are the premium tubular mortice latches, 3 lever Sashlocks and 3 lever deadlocks. They are essential to help prevent the spread of fire by ensuring the door remains closed in its frame in the event of a fire. All Locks and latches in the Perry Shield range, mortice or tubular, comply with BS EN 12209, are CE marked and are CERTIFIRE approved. These may be lockable or un-lockable types depending on door requirements.