331U81F escape door opener, robust design for the highest demands, the escape door opener is intended exclusively as an additional locking device for the fire door, independent of the main lock. It must not be installed as a counterpart to the main lock, otherwise the function of the fire door is no longer guaranteed. The escape door opener and the associated counterpart 807-10 have been tested in accordance with the applicable regulations and are recognized as suitable for the electrical locking of doors in escape routes.