NEC 2000 Series - Manual (Page 99)

Setting Up a Healthy Work Environment A-5
T Extend your lower legs slightly so that the angle between your thighs
and lower legs is 90° or more.
T 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.
T Be sure that you have adequate clearance between the top of your
thighs and the underside of your workstation.
T 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.