what is hh exit device

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For Warranty information, visit us.allegion.com/warranty or contact Customer Service at 877-671-7011.  
No, the 33A is not compatible with the AD and  CO 993  chassis units. The  33A can only be driven in a clockwise direction. This would restrict it to right hand installs only.
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.
Von Duprin has a maintenance kit part number 050046-00 and maintenance instruction, part number 941079-00 for 98/99 series devices. There are some common parts between 98/99 series and 22...