cylinder for mullion

RELATED FAQS

Question
Answer
The KR54-F is used on electrified mullions (panic and fire) because it has a route for the wires.
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.
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
Bottom mounting fitting on 9954 is taller than 4954. The taller bottom fitting is required for a fire rated application.