ADA explains only that the clear area of an opening must be wide enough to be accessible to persons with disabilities. It is important to note however, that this is the ANSI standard. Some municipalities have established more stringent measurements as their clear area. These stricter guidelines must be followed in the localities that have adopted them. The problem that exists with clear area and exit devices is equally as complicated as the issue of clear area itself.
Exit devices protrude from the face of a door.
If so, even when an exit device protrudes into clear area, the opening would still be considered ADA compliant because the measurement would be taken from door face to stop face. The solution to this problem is simple architectural foresight. When planning a building meant to be accessible to the general public, consider what kind of exit devices will be used. Then, simply design enough clear area into the openings that the projection of an exit device is inconsequential. Be proactive in designing and then frantic reaction to accessibility issues will be unnecessary.