Factory Direct Hardware Von Duprin 9957EO26D3 - Manual (Page 53)

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98/99™ Popular Double Door Applications
Mortise lock and surface mounted or Concealed Vertical
rod device combination—same direction
Two vertical rods—double egress
Two rim devices with mullion—
same direction
Two surface mounted vertical rod
devices—same direction
(do not use with overlapping astragal)
Popular Double Door Applications
Two FEH vertical rods with auxiliary fire latch—
LBR option
Auxiliary Fire Latch