General Course of Action:
The chair base must be a five-point unit will roll across carpeted floors without pulling the carpet into the housing. The casters should be large enough to require a minimum effort to move the chair. The five-point base will measure not less than twenty-three inches across. The roller should be removable and capable of being replaced.
The seat pan must be adjustable for forward and backward tilt angle independent of lumbar support adjustment. The seat pan will adjust forward at least 2" This action will move the seat pan forward away from the backrest for the prescribed distance and provide a longer seat pan reach.
The forward leading edge of the seat pan must cascade to a rounded edge that has a downward sloping angle, and shall have a concave contour for even weight distribution. The cushion deformation measured at the center of the seat pan shall be no more than one inch, as measured from a plane formed by a straight edge laid across the top of the seat of the pan.
The backrest must be contoured to provide lumbar support and be adjustable for height and for angles ranging from behind the vertical to forward of the vertical position. The back support should have a vertical height adjustment span of at least three and one-half inches. The height adjustment may be achieved with one gross adjustment or with a combination of adjustment mechanisms.
Arm supports must be adjustable for height and be removable. The height adjustment will be at least two and one-half inches, as measured from the lowest position of the armrest to the full-extended position of the armrest. The armrest should be easily removed and adjustable without the use of tools.
All adjustment mechanisms must be readily operable and within easy reach of the chair user. Adjustments must be capable of being accomplished without the use of tools. It is preferred that adjustment mechanisms be provided with labels as to their function.