The Abloy EL402 F/UN Electric Lock is a high security lock (fail unlocked) suitable for narrow style doors and has a steel trigger & deadbolt. Its double action bolt deadlocks when door closes and collapses into the lockcase as the door is opened (push or pull). The EL402 F/UN is non handed, suitable for horizontal installation and incorporates key/thumbturn override at all times. It is recommended that mechanical override is always used with this lockcase. Not recommended for use with fire route doors.