The answer to the minimum door opening width for a device depends on the specific device in question.
Start by looking in the catalog for the series of device you plan to use.
Then look at the section of the catalog for each of the options included in the device to see if that option affects the minimum door opening width.
For example, for a CX99 Rim device, start with the page discussing the 99 Rim device in the 98/99 Series Catalog, then consult the pages concerning the Chexit (CX) option for how it affects the answer.
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