What is AFL on fire rated LBR exit devices?

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1400 degrees which is approximately 20 minutes after the fire starts.
The Von Duprin 1609 cannot be used on a pair of fire rated doors. We recommend using the Von Duprin fire rated mortise exit device in lieu of the rim device such as the Von Duprin 5575-F, 8875-F or...
No, dogging cannot be added to a fire-rated mechanical exit device. Fire rated devices can be only electronically dogged and drop during fire activation.
There is not a fire rated version of the Von Duprin 33A/35A rim device.  Only the vertical rod devices (33/3527A-F, 33/3547A-F, 33/3548A-F) can be fire rated.
Yes, as an option, Steelcraft doors are available with factory prepared for the 98/9949 Concealed Vertical Cable Exit Device. L, B, CE, T and CE-Series doors are available factory prepared Door...
AFL stands for "Auxiliary Fire Latch" on fire rated exit devices.
Installation should be 6" from bottom of the door. See attached templates as reference.  T-5494 for HM Doors W-5494 for Wood Doors