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5.5.4.2.1 Vertical Fenestration Area
The total vertical fenestration area shall not be greater than that specified in Tables 5.5-0 through 5.5-8.
Exception to 5.5.4.2.1
Vertical fenestration complying with Exception 3 to Section 5.5.4.4.1.
5.5.4.2.2 Maximum Skylight Fenestration Area
The total skylight area shall not be greater than that specified in Tables 5.5-0 through 5.5-8.
Exception to 5.5.4.2.2
The total skylight area is permitted to be increased to no greater than 6% of the gross roof area, provided the skylights meet all of the criteria in Exception (1) to Section 5.5.4.4.2 and the total daylight area under skylights is a minimum of half the floor area of the space.
5.5.4.2.3 Minimum Skylight Fenestration Area
In any enclosed space in a building that is
  1. 2500 ft2 and greater;
  2. directly under a roof with ceiling heights greater than 15 ft; and
  3. one of the following space types: office, lobby, atrium, concourse, corridor, storage (including nonrefrigerated warehouse), gymnasium, fitness/exercise area, playing area, gymnasium seating area, convention exhibit/event space, courtroom, automotive service, fire station engine room, manufacturing corridor/transition and bay areas, retail, library reading and stack areas, distribution/sorting area, transportation baggage and seating areas, or workshop,
the total daylight area under skylights shall be a minimum of half the floor area and either
  1. provide a minimum skylight area to daylight area under skylights of 3% with a skylight VT of at least 0.40 or
  2. provide a minimum skylight effective aperture of at least 1%.
These skylights shall have a glazing material or diffuser with a measured haze value greater than 90% when tested according to ASTM D1003. General lighting in the daylight area shall be controlled as described in Section 9.4.1.1(f).
Exceptions to Section 5.5.4.2.3
  1. Enclosed spaces in Climate Zones 6 through 8.
  2. Enclosed spaces where it is documented that existing structures or natural objects block direct-beam sunlight on at least half of the roof over the enclosed space for more than 1500 daytime hours per year between 8 a.m. and 4 p.m.
  3. Enclosed spaces where the daylight area under roof monitors is greater than 50% of the enclosed space floor area.
  4. Enclosed spaces where it is documented that 90% of the skylight area is shaded on June 21 in the Northern Hemisphere (December 21 in the Southern Hemisphere) at noon by permanent architectural features of the building.
  5. Enclosed spaces where the total area minus the primary sidelighted area and secondary sidelighted area is less than 2500 ft2 and where the lighting is controlled according to sidelighting requirements described in Section 9.4.1.1(e).

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