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Why is the vertical rod backset different from the centercase backset for the Von Duprin 98/9947 WDC devices?

In an effort to get the rods "closer" to the edge of the wood door, an "offset" link is used between the rod backset (1 5/16") vs. the 98/9947 WDC centercase backset (2 1/2").  This allows the rods to be mounted closer to the edge of the door making the prep easier for most wood door suppliers.  

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