Can I use the Von Duprin 377T thumbturn control with key override and the E373 L BE for my 8827 device?

Yes, this can be done.  The E373L BE does NOT have cylinder override.  If FSE is ordered and power would fail, the lever would be locked.  If the 377T would be used, it would allow the thumbturn control to lift the vertical rods for key/thumbturn entry. 

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