what does xp indicate

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The Von Duprin XP98/99 device uses a different strike than standard 98/99 device. The 909 strike is for non fire rated XP devices and the 954 strike is for the fire rated XP device. 49/9954 mul...
The latch bolt on an XP98/99 exit device does not retract. The latch bolt will release and pivot out of the way when push bar is depressed or out side trim is activated.
Von Duprin does not recommend using XP98/99 devices with any electric strike.   Von Duprin recommends using the standard 98/99 rim device.