First, these options are only used for a 2800 concealed series Sr. Swing that’s being used with center pivots. In this situation, the operator will become the head frame of the opening, and just as with a normal frame, you need to have some sort of “frame stop” to stop the door at the fully closed position. The POS (Positive Mechanical Stop) and BKY (Panic Breakaway Stop) will both provide this functionality.
The difference between a POS and BKY is how the door can act in an emergency situation. With a POS, there will be no change in behavior – the door will still have to be opened in the swing direction it normally opens. In contrast, a BKY will allow the door to swing out in the opposite direction it normally swings once 50 lbs. of force are applied to the door. This will also disable the 2800 until the door is pushed back with 50 lbs. of force so that it can swing normally again. This type of function would also require a cased open frame.
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