Figure 27a
Drinking Fountains and Water Coolers - Spout Height and Knee Clearance

In addition to clearances discussed in the text, the following knee clearance is required underneath the fountain: 27 inches (685 mm) minimum from the floor to the underside of the fountain which extends 8 inches (205 mm) minimum measured from the front edge underneath the fountain back towards the wall; if a minimum 9 inches (230 mm) of toe clearance is provided, a maximum of 6 inches (150 mm) of the 48 inches (1220 mm) of clear floor space required at the fixture may extend into the toe space. (4.15.2, 4.15.5)