The LEED Reference Guide for Green Building Design and Construction, 2009 Edition and LEED Reference Guide for Green Interior Design and Construction, 2009 Edition indicate the following instructions for determining the direct line of sight in section view. "Using representative building sections, draw a line at 42 inches (typical seated eye height) across the section to establish eye height and any obstruction to the perimeter glazing, Draw one or more representative sight lines from a point at eye height in the regularly occupied space to the perimeter vision glazing."Is the direct line of sight drawn from the area to the perimeter vision glazing in section view required to be a horizontal line at 42 inches above the finished floor? Can the direct line of sight slope from 42 inches at the seated area to any location within the vision glazing?
To determine direct lines of sight in section, provide one or more representative sight lines from a point at eye height (42 inches) in the regularly occupied space to perimeter vision glazing between 30 inches and 90 inches above the finished floor of the building. The direct line of sight may be slope from 42 inches at the seated area to any unobstructed area of the vision glazing. The direct line of sight is not required to be horizontal at 42 inches only. Internationally Applicable.