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Basic ADA Guidlines
A number of people have asked me the question about mounting guide lines as they relate to ADA. While most have a general knowledge (between 42” and 48” center) it is still a mystery as to the exact guidelines. The figures below are taken from the ADA’s web site (http://www.access-board.gov/adaag/about/index.htm) after some rooting around. They depict the exact range for mounted devices allowable by the ADA.
***ADA Guidelines are a national standard that serve as a minimum; however, that’s not to say a particular End User will not. ***

Figure 1 High and Low - Side Reach Limits
The 30 by 48 inch wheelchair clear floor space is located a maximum 10 inches (255 mm) from the wall.

Figure 2 High Forward Reach Limit
Forward reach range shown in profile and plan view to be 48 inches maximum and 15 inches minimum.