NEC POWERMATE VT 300 Manual page 162

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Your seat depth should allow your lower back to
comfortably contact the backrest. Make sure that the backs
of your lower legs do not press against the front of the
chair.
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Extend your lower legs slightly so that the angle between
your thighs and lower legs is 90° or more.
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Place your feet flat on the floor. Only use a footrest when
attempts to adjust your chair and workstation fail to keep
your feet flat.
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Be sure that you have adequate clearance between the top
of your thighs and the underside of your workstation.
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Use armrests or forearm supports to support your
forearms. If adjustable, the armrests or forearm supports
should initially be lowered while all the other adjustments
discussed in this appendix are made. Once all these
adjustments are completed, raise the armrests or adjust the
forearm supports until they touch the forearms and allow
the shoulder muscles to relax.
A-6 Setting Up a Healthy Work Environment