The sitting height is 400mm to 440mm, the size difference is 10mm, and the sitting depth is between 380 mm and 420 mm.

The standard size of the chair-the width of the sitting surface of the chair is often the shape of the front width and the back width according to the sitting posture and movements of people. The front width of the sitting surface is called the width before sitting and the back width is called the width after sitting.

Generally, the width of the armchair is not less than 380 mm, and the support of the human arm should be considered. The inner width of the handrail should be taken as the size of the sitting width, and an appropriate margin should be increased according to the average shoulder width of the human body, generally not less than 460mm, but it should not be too wide. The shoulder width of the natural hanging arm shall prevail.