what cylinder do KR mullions use

RELATED FAQS

Question
Answer
Von Duprin KR (key removable) mullions requires a 1-1/8" or 1-1/4" mortise cylinder with the standard straight cam, the cam is not inverted. Please see chart below for part numbers. 
instructions
The KR54-F is used on electrified mullions (panic and fire) because it has a route for the wires.
4754, 4854 and the 9854 are electrified mullions and handed as noted below: 4754 is not handed: Prepared for two 4263 monitor strikes. Use with all Von Duprin rim panic devices 4854 is han...
The KR4023 mullion requires a 1-1/4" mortise cylinder with straight cam. This is stated in box 7 on the first page of the KR4023 mullion instructions.
EL98/99-4 ft rim device required minimum of 35.2" with 5/8" stop height door opening on single door and 35.56" with 4954/9954 mullion.
There is no mullion for double egress openings.  Mullions only applies to the doors that open in the same direction.