what is SD option

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SD option is available and is also standard with Von Duprin 98/99 rim and vertical rod exit devices but not available with mortise device.
Special Dogging can be added but you will need a new center case assembly, cylinder dog housing, and center case cover. 050550, SD center case kit RHR and 050551, SD center case kit LHR. 112409...
This option is not available as the solenoid is in the mechanism case where the dogging components would go.  An HD-EL solenoid is not available, and Special Dogging(SD) is not an option ...
SD is Special cylinder dogging in the center case of 98/99 rim and vertical rod non fire rated devices and is available with standard, EL, QEL, CX and ALK.
 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.