Page 462 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

422 App endix B

Footcandle (fc) (1) A unit of illuminance equal to one lumen of light falling on a one-square-
foot area from a one candela light source at a distance of one foot (as per LEED-NC 2.2)
or (2) a measure of light falling on a given surface. One footcandle (1 fc) is equal to the quantity
2
of light falling on a one-square-foot (1-ft ) area from a one candela (1-cd) light source at a
distance of one foot (1 ft). Footcandles can be measured both horizontally and vertically by a
footcandle or lightmeter (as per LEED-NC 2.1). The second definition is more comprehensive.

Formaldehyde ‘A naturally occurring VOC found in small amounts in animals and plants,
but that is carcinogenic and an irritant to most people when present in high concentrations,
causing headaches, dizziness, mental impairment, and other symptoms. When present in
the air at levels above 0.1 ppm (parts per million), it can cause watery eyes; burning sensations
in the eyes, nose, and throat; nausea; coughing; chest tightness; wheezing; skin rashes; and
asthmatic and allergic reactions.’
Full Cutoff Luminaire A full cutoff luminaire has zero candela (0-cd) intensity at an angle
of 90 degrees above the vertical axis (nadir) and at all angles greater than 90 degrees
from nadir. Additionally, the candela per 1000 lamp lumens does not numerically exceed
100 (10 percent) at an angle of 80 degrees above nadir. This applies to all lateral angles around
the luminaire (as per LEED-NC 2.1).
Functional Performance Testing (FPT) ‘The process of determining the ability of the
commissioned system to perform in accordance with the owner’s project requirements, basis
of design, and construction documents.’
GFA Gross floor area. See Square Footage of a Building.
Glare Sensation produced by luminance within the visual field that is significantly greater
than the luminance to which the eyes are adapted, which causes annoyance, discomfort, or
loss in visual performance and visibility (as per LEED-NC 2.1).
Glazing Transparent part of a wall and usually made of glass or plastic. Wikipedia, 10/10/06.
Glazing Factor ‘The ratio of interior illuminance at a given point on a given plane (usually
the work plane) to the exterior illuminance under known overcast sky conditions. LEED
uses a simplified approach for its credit compliance calculations. The variables used to
determine the daylight factor include the floor area, window area, window geometry, visible
transmittance T , and window height.’
vis
Graywater or Greywater ‘Term defined by the Uniform Plumbing Code (UPC) in its App. G,
titled “Graywater Systems for Single-Family Dwellings,” as “untreated household waste-
water which has not come into contact with toilet waste. Graywater includes used water
from bathtubs, showers, bathroom wash basins, and water from clothes-washer and laundry
tubs. It shall not include wastewater from kitchen sinks or dishwashers.” The International
Plumbing Code (IPC) defines graywater in its App. C, titled “Graywater Recycling Systems,”
as “wastewater discharged from lavatories, bathtubs, showers, clothes washers, and laundry
sinks.” Some states and local authorities allow kitchen sink wastewater to be included in
graywater. Other differences with the UPC and IPC definitions can probably be found in
state and local codes. Project teams should comply with the graywater definitions as
established by the authority having jurisdiction in their areas.’
Greenfield Sites ‘Those that are not developed or graded and remain in a natural state.’
Greenfields ‘Sites that have not been previously developed or graded and remain in a
natural state.’