1. The chair should be easily adjustable.
2. The chair should have a sturdy five-legged base with good chair casters that roll easily over the floor or carpet.
3. The chair should swivel 360 degrees so it is easier to access items around your workstation without twisting.
4. Minimum range for seat height should be about 16 inches.
5. Seat pan length should be 15 inches to 17 inches.
6. Seat pan width should be at least as wide as the user's thighs. A minimum width of about 18 inches is recommended.
7. Chair edges should be padded and contoured for support.
8. Seat pan tilt should have a minimum adjustable range of about 5 degrees forward and backward.
9. Avoid severely contoured seats as these limit seated postures and are uncomfortable for many users.
10. Front edge of the seat pan should be rounded in a waterfall fashion.
11. Material for the seat pan and back should be firm, breathable, and resilient.
12. The seat pan depth should be adjustable. Some chairs have seat pans that slide forward and backward and have a fixed back. On others the seat pan position is fixed and the backrest moves horizontally forward and backward so the effective depth of the seat pan can be adjusted. Beware of chairs where the back only tilts forward and backward. These do not provide adequate adjustment for a wide range of users.
13. The backrest should be at least 15 inches high and 12 inches wide and should provide lumbar support that matches the curve of your lower back.
14. The backrest should widen at its base and curve in from the sides to conform to your body and minimize interference with your arms.
15. The backrest should allow you to recline at least 15 degrees and should lock into place for firm support.
16. The backrest should extend high enough to support your upper trunk and neck/shoulder area. If the backrest reclines more than about 30 degrees from vertical, a headrest should be provided.
17. Armrests should be removable and the distance between them should be adjustable. They should be at least 16 inches apart.
18. Armrest height should be adjustable between 7 inches and 10.5 inches from the seat pan. Fixed height armrests are not desirable, especially for chairs that have more than one user.
19. Armrests should be large enough (in length and width) to support your forearm without interfering with the work surface.
20. Armrests should be padded and soft.
21. Most chairs are designed for weights under 275 pounds. If the user weighs more than 275 pounds, the chair must be designed to support the extra weight.