- operations that consist of several different tasks requiring different working heights (sitting and standing) can be done at a workplace 91 cm (36 in.) above the floor with an adjustable footrest. Workplace height for standing tasks can be raised by using 10-30-cm (4-12-in.) platforms on top of the work surface. At least 51 cm (20 in.) of forward leg clearance is required at a sit/stand workplace (see Figure llA-3). Supports that can be used at sit/stand workplaces are discussed in Section IIB, "Adjustable Design Approaches.
- Work surfaces using large-size products or drawings, such as light tables used in photographic reproduction operations, are often 112 cm (44 in.) high. The work done on these tables lends itself to a sit/stand operation; provision of adequate leg clearance considerably reduces static loading on the legs and back of people as they lean over large drawings or negatives.
In most workplaces, whether seated, standing, or sit/stand in design, there is a tendency to use the space under the work surface for storage, thereby reducing the leg clearance. Cabinetry and storage shelves should be located so that they do not interfere with the clearances previously indicated in Figures IIA-3, ILA-4, and LLA-7.