Additional Information about: [Backrest] [Height] [Seat Pan]
Seat Pan
The seat pan should:
- have enough depth to allow contact between the user’s lumbar region and the seat back. The depth of the seat should be between 15 to 18 inches and 18 inches wide.
- have a "waterfall" design at the front of the seat, i.e. slightly concave with a softly padded round edge. The purpose of the "waterfall" design is to avoid pressure on the back of the leg above and below the knee.
- allow the user to adjust its angle and should ensure the angle between the upper and lower leg is at least 60 degrees and no more than 100 degrees when the lower leg is perpendicular to the floor. The adjustment range should allow backward tilt to at least 8 degrees (10 degrees preferred) and forward tilt to a maximum 5 degrees from horizontal. Because some tasks require leaning forward, such as reading poor quality documents, leaning forward should be accomplished by tilting the seat, not the torso, as sitting at less than 90 degrees from the thighs puts pressure on internal organs.
