double cylinder exit

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Answer
Double cylinders are only available on Von Duprin 98/99 Rim and 98/9975 Mortise devices.
A double cylinder(-2) option is not available on a Falcon device but is available from Von Duprin.
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.
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...
The ALK uses a 1 1/4" mortise cylinder with straight cam. (NO DOGGING)