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You can increase the comfort and safety of your work environment, and
decrease your chances of cumulative trauma disorder, by following the
guidelines given below.
Also check out Take Ten for tips for adjusting your work area, and
information on safe work habits and exercises for your neck, shoulders,
wrists, and hands.
Table 1 shows recommended guidelines for furniture and system adjustment, as developed by the American National Standards Institute (ANSI).*
Local VDT guidelines issued by country, state, or municipality may apply and supersede the guidelines in Table 1.
Table 1 - ANSI/HFS 100-1988 Guidelines for VDT Workplace Adjustment
|Seat pan height||40.6 (16.0)||46.3 (18.2)||52.0 (20.5)|
|Work surface height (keyboard
|58.5 (23.0)||64.75 (25.5)||71.0 (28.0)|
|Screen viewing height||>30.5 (>12)||>30.5 (>12)||>30.5 (>12)|
|Screen viewing angle||0-60 degrees||0-60 degrees||0-60 degrees|
Adjustment parameters are defined in the following illustration.
Guidelines are shown for small females (standing height of 150 cm or 59
in.) and large males (standing height of 185 cm or 73 in.). Midpoints
are also interpolated for persons of more average height.
(Adapted from ANSI/HFS 100-1988)
If you work on a CAD system, you may feel more comfortable using the ranges of adjustment shown in Table 2.
Table 2 - Workstation Adjustment Preferred by CAD Users
|Seat pan height||54 (21.3)||50-57 (19.7-22.4)|
|Work surface height||73 (28.7)||70-80 (27.6-31.5)|
|Monitor center above floor||113 (44.5)||107-115 (42.1-45.3)|
|Screen viewing distance||70 (27.6)||59-78 (23.2-30.7)|
|Work surface tilt||8.6 degrees||2-13 degrees|
|Monitor tilt||-7.7 degrees||-15 - + degrees|
* American National Standard for Human Factors Engineering of
Visual Display Terminal Workstations. ANSI/HFS 100-1988.
Available through the Human Factors Society, Inc.,
P.O. Box 1369, Santa Monica, CA, 90406, USA.