EL402-F/UN. The Abloy EL402 F/UN Electric Lock is a high security lock (fail unlocked) suitable for narrow stile 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.. Adjustable backset. Double action bolt (deadlocks when door closes and collapses into lockcase as door is opened (push or pull). Key/thumbturn override at all times. Suitable for horizontal installation