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the total primary sidelighted area is the combined primary sidelighted area within each space. Each primary sidelighted area is directly adjacent to vertical fenestration in an exterior wall below the ceiling (see Figure 3.2-4).
  1. The primary sidelighted area width is the width of the vertical fenestration plus, on each side, the smaller of
    1. one half of the vertical fenestration head height (where head height is the distance from the floor to the top of the glazing) or
    2. the distance to any 5 ft or higher opaque vertical obstruction.
  2. The primary sidelighted area depth is the horizontal distance perpendicular to the vertical fenestration, which is the smaller of
    1. one vertical fenestration head height or
    2. the distance to any 5 ft or higher opaque vertical obstruction.
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