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“ what is SD ”

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Resolution: 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.:

Is dogging available w/ EL option on 24 or 25 series devices?

Resolution: 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 optio...:

Is the SD option available with Von Duprin QEL 98/99 exit devices?

Resolution: 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.: