fire rated exit devices

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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...
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...
Installation should be 6" from bottom of the door. See attached templates as reference.  T-5494 for HM Doors W-5494 for Wood Doors
A standard exit device can't be modified to a fire rated exit device.  A new device must be purchased.
The Von Duprin Guard-X exit device is not fire rated because the deadbolt is not spring loaded. Therefore, there would be no positive latching as required on a fire rated opening. 
9875-F Series,9975-F Series , 5575-F, 8875-F