exit device falcon cylinder

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Answer
A double cylinder(-2) option is not available on a Falcon device but is available from Von Duprin.
The Exit Alarm takes a 1 1/8" Mortise cylinder with a straight cam. See first page of Exit Alarm inst below. Exit Alarm inst
The ALK uses a 1 1/4" mortise cylinder with straight cam. (NO DOGGING)
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...
 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.
Equivalent to the Schlage D series line with a C keyway. Part number 21-002.