what is concealed vertical rod

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Devices built After 2/28/2011: Use a 1 1/8" - 1 1/4" mortise cylinder with straight narrow cam. (Cam profile same as the Schlage B520-731, see table below for part numbers) Devices built Befo...
 Modular 1-1/8"  Modular 1-1/4"  SFIC and FSIC  Non-Modular Non-IC Conventional  Non-Modular Non-IC Everest Primus  B520-730  B520-731  B520-2...
There are two main differences:The bottom latches are differentThe Von Duprin 98/9947 concealed vertical rod device covers up to 1/4" undercutThe Von Duprin 98/9948 concealed vertical rod device co...
They both use Template # 10320_c
The AD or CO - 993 is NOT compatible with a Von Duprin 98/99 Concealed Vertical Rod exit device on wood doors.