A pressure relief door (PRD) assembly is provided and includes a PRD frame, a PRD hinge-coupled to the PRD frame, a latch element configured to normally remain in a latched condition to maintain the PRD in a closed condition relative to the PRD frame and to assume an unlatched condition to permit the PRD to assume an open condition relative to the PRD frame in accordance with an occurrence of a burst duct event within the PRD frame and a retention element. The retention element is configured to automatically activate responsive to the PRD opening. The retention element includes an end disposable between the PRD and the PRD frame with the retention element automatically activated to provide positive interference directed to maintain the PRD in the open condition.

A sliding-door system includes a sliding door, a door frame, and a locking system, wherein in a locked state, a first latch engages in an engagement notch of an anchor body locking the sliding door, and a bolt engages on the anchor body in an engagement region to prevent the anchor body from rotating about a rotational axis. An actuator moves the bolt out of the engagement region to switch the locking system from the locked state into an open state by rotating the anchor body about the rotational axis. A locking system emergency opening function is actuated by applying an emergency activation force to a first door leaf to move a lock substantially perpendicular to a surface of the first door leaf such that the engagement notch is slid out of the engagement region to enable the sliding door to open.