Exterior fixtures with occupancy sensors cannot be excluded from the shielding requirements if pursuing Option 2.
LEED Interpretation #2099, issued 4/24/2008, allows the use of circuit transducers that measure fan status of 100% outside air and constant volume fan systems as an alternative to an airflow measuring station for this credit. For constant volume and 100% outside air systems that have been accurately balanced, monitoring the fan status is adequate to maintain proper outside air volumes. This is not an appropriate strategy for variable volume systems.
None of this area qualifies. You should take is as a cue that your area is likely to have glare issues, and consider either lowering your glazing visual light transmittance, or reducing your window size.
Recalculate zone floor area (ZFA) = (WA xVLT)/0.150. So if, for example, you have a window area of 120 ft2 and a VLT of 0.4, ZFA = (WA xVLT)/0.150 = (120 x 0.4)/0.150 = 320. There is one caveat and that is that your ZFA must be equal to or greater than your zone width. Otherwise you must enter 0 for this ZFA.
The latest definition for a regularly occupied space (per a 2011 addendum) is “an area where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building."
The standard eye height for an adult while seated is 42". Depending on the use of the space, the eye height may be at 5’9” or lower. The idea is that the occupant should not have to move their head significantly to view outside. Also, with having access to view at this height, the peripheral vision is not affected. Occupants still receive glimpses of the outside.
Yes. LEED Interpretation 10254, made on 10/1/2012, allows sloped view lines starting at 42 inches in IEQc8.2 and specifically states that the view line is not required to be horizontal: "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.
No. According to a 5/9/2011 addendum, movable furniture and movable partitions are not included in the scope of this credit calculation. Movable furniture and partitions are those that can be moved to provide access to the view by the user without the need for tools or assistance from special trades and facilities management.
View Factor has been determined per the Heschone Mahone Group Study "Windows and Offices: A Study of Office Worker Performance and the Indoor Environment," page 47 (see Resources). A component to achieving Exemplary Performance for IEQc8.2 is having 90% of project's regularly occupied spaces achieve a View Factor of 3+. View Factors are assigned 1–5 and are based on Primary View and Break View. See the study for further detail, including a visual depiction of View Factors 1–5.
This credit has relatively few LEED Interpretations, and so there may not be specific guidance from USGBC on some specific issues such as this one. It appears likely that a loading dock should be considered part of the building structure, and included, but some exterior appendages or structures may be more appropriate to exclude.