GENERAL NOTES: (1) Data was calculated using the LBNL Window computer program per NFRC environmental conditions. (2) 90% argon/10% air fill is used for IG’s with LoE coated glass, otherwise 100% air fill is used for uncoated units. (3) The UV Transmittance is determined as an average for wavelengths 300 -380 nm. (4) UV Damage Weighted Transmittance (Tdw) is the weighted average for wavelengths 300 – 700 nm (based on CIE 89/3).
All values calculated using LBNL Window computer program. See http://windows.lbl.gov/software/default.htm
for more information on glass optical data and the Window computer program.
Solar Heat Gain Coefficient – (SHGC)
– The amount of solar radiation that enters a building as heat. The lower the number, the better the glazing is at preventing solar gain.
– The portion of energy transmitted in a spectral region from 300 to 700 nanometers. This region includes all of the ultraviolet energy and part of the visible spectrum, and will give the best representation of relative fading rates. The lower the number, the better the glass is for reducing fading potential of carpets and interior furnishings.
– This represents the heat flow rate through a window expressed in BTU/hr/ft²/°F, using winter night weather conditions of 0°F outside and 70°F inside. The smaller the number, the better the window system is at reducing heat loss.
Cardinal actively supports and participates in the National Fenestration Rating Council (NFRC). Windows with LoĒ³-340
that are rated and certified by the NFRC can comply with Energy Star™
requirements in all regions of the country.
for more information on the Energy
Star windows program.