What is the minimum header length for an independent pair Sr. Swing operator?

The minimum length header for a Sr. Swing independent pair operator (2 Control Boxes) is 65" for both the surface mounted 9563 (push, pull, or double egress) and the concealed 2863 with an OP arm, or 70" for a concealed 2863 with a CP arm and stop (breakaway or fixed).

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