What is EO function?

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"BA" stands for basic assembly or what is now referred to as Exit Only(EO)
The devices are not built function specific and the exit only(EO) devices will accept any of the 500 series trims.
EO (BHMA Exit Function)
Apartment Corridor Lock function is defined as a lock where the latch bolt operated by lever from either side, except when outside lever is made inoperative by a stop or mechanical means other than...
To add a cylinder to the 98/99-EO rim device order a 110NL-MD for metal door or 110NL-WD for wood door with a standard rim cylinder and prep the door per template.