Associated Locksmiths of America (ALOA) Practice Test

Automatic flush bolts are primarily designed for use with double doors, where two doors meet at a shared frame. These devices are an integral part of the locking mechanism for double doors, providing a secure locking point on the inactive door, which is the one that does not have a dedicated key cylinder or handle.

When one door is closed, the automatic flush bolt extends vertically into the door frame, securing the inactive door in place, thereby enhancing the overall security of the entrance. This mechanism allows for greater convenience and efficiency, as the flush bolt can automatically engage when the active door closes, simplifying the operation of securing both doors without requiring manual intervention each time.

This functionality is specifically advantageous for entrances that require a dual door system, as it ensures that both doors can be secured together seamlessly, whereas single doors, sliding doors, and bi-fold doors typically rely on different locking mechanisms that cater to their specific operational designs and security needs.