9827-F/9927-F Fire exit surface mounted vertical rod device pairs of doors up to 8 Ft. x 10 Ft. (2438mm x 3048mm) , UL listed for fire exit hardware. Devices are ANSI A156.3 – 2008 Grade 1. The 9827-F device has a smooth mechanism case and the 9927-F device has a grooved case. The surface vertical rod device is non-handed except when the following device options are used: SS (signal switch), and WS (Tornado/Hurricane). Vertical rod and latch guards are available to protect the bottom rod of the exit device from damage by impacts of carts or gurneys passing through doors. Rod and latch guards can be used on hollow metal or tin clad composite fire doors.