what cylinder for exit devices?

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Double cylinders are only available on Von Duprin 98/99 Rim and 98/9975 Mortise devices.
The rim cylinder with thumbturn, XB11-979 (Figure 1) was designed to be installed on the inside head of the Von Duprin 98/99–2 double cylinder exit devices, see Figure 1. The rim cylinder with...
Cylinder dogging (CD) and an RX switch can be ordered together with 33/35 or 98/99 series.
This can be done ONLY with non fire rated exit devices.
The ALK uses a 1 1/4" mortise cylinder with straight cam. (NO DOGGING)
Standard exit alarm ALK devices are available with cylinder dogging option as of October, 2011. The device can be ordered standard with cylinder dogging and exit alarm ALK option on non fire rat...
Equivalent to the Schlage D series line with a C keyway. Part number 21-002.
 A 1 1/4" cylinder with straight cam is required for the Von Duprin SD (Special Dogging) exit device option.
The cylinder cam must be inverted with the SD option to work properly.