Other - You have a chair that is not in the chair list. Use the Chair Checklist to learn about the features your may have and how to use them.
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You may be able to identify the chair by looking on the bottom of the seatpan for a manufacturer's label. If so, you can do an Internet search to find out how to adjust the chair.
If you cannot ID the chair, use the Chair Checklist to help you learn about the features of your chair.
In many instances your chair will have the features you need to adjust it properly for you.