Glossary of Window and Glass Terms

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Thermal Lo-E Glass • Comfort • Clarity • Energy Efficiency

Ver. 2014-07

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CONDUCTION: Heat transfer through a material. Heat flows from a higher-temperature area to a lower-temperature area.

EMISSIVITY: The relative ability of a surface to reflect or emit heat by radiation. Emissivity factors range from 0.00 to 1.00 and are typically measured in U-Factor (or its inverse R-Value). The lower the emissivity, the less heat that is emitted through a window system.

R-VALUE: The measure of a product’s ability to resist the transfer of thermal energy. The inverse of U-Factor (R = 1/U). A high R-Value window has greater resistance to heat flow and a higher insulating value than one with a low R-Value.

PASSIVE SOLAR HEAT GAIN: Solar heat that passes through a material and is captured naturally, not by mechanical means.

SOLAR HEAT GAIN COEFFICENT (SHGC): The fraction of solar radiation transmitted through a window or skylight, expressed as a percentage. The lower a window’s SHGC, the less solar heat it transmits and the greater its shading ability. Generally, a lower SHGC is desirable in warm climates and a higher SHGC is desirable in cold ones.

U-FACTOR (ALSO U-VALUE): A measure of the rate of nonsolar heat flow through a material or assembly. It is expressed in units of Btu/°F x sq. ft. x hr. and may be expressed for the glass alone or for the entire window assembly, including frame and spacer materials. The lower the U-Factor, the greater a window’s resistance to heat flow and the better its insulating value.

SeriesU

Factor SHGC2 VT2

Air Infil-

tration

500 Single Hung .41 .30/.27 .53/.48 .08

525 Single Slider .40 .30/.27 .55/.49 .08

550 Picture Window .35 .32/.29 .59/.53 .01

700 Double Hung .43 .29/.23 .52/.41 .16

725 Double Slider .45 .29/.23 .52/.41 .11

750 Picture Window .36 .32/.29 .59/.53 <.01

900 Casement .51 .28/.26 .49/.44 .05

925 Awning .51 .28/.26 .49/.44 .05

6600 Single Hung .30 .28/.25 .52/.47 .10

6625 Single Slider .29 .28/.26 .53/.47 .12

6800 Double Hung .30 .27/.24 .50/.45 .15

6825 Double Slider .29 .28/.25 .52/.46 .19

6850 Picture Window .27 .32/.29 .60/.54 .02

9900 Sliding Glass Door .40 .32/.28 .58/.51 .12

Product Performance1

1 NFRC 100/200 simulations performed by independent testing labs, using insulated glass with AGC Ti-AC36 on surface 2, clear glass, Super Spacer® and argon gas fill. Thermal Lo-E uses AGC Comfort Select 36, a new generation of AGC Ti-AC36. Additional simulations are pending.2 First figure is without internal grids, second figure includes grids.

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Thermal Lo-E insulated glass starts with glass manufactured by AGC Flat Glass North America. AGC is committed to environmental stewardship through the use of recyclable materials and sustainable processes in the

manufacturing and distribution of their state-of-the-art, energy-efficient flat-glass products. AGC is a supplier/partner to the ENERGY STAR program, a joint program run by the U.S. Environmental Protection Agency and the U.S. Department of Energy, as well as the Leadership in Energy and Environmental Design (LEED®) program of the U.S. Green Building Council. By choosing Thermal Windows with AGC glass, you can be sure you’re getting the best industry technology available for your home.

COOL HEAT-BLOCKERSo how cool is Thermal Lo-E glass? Cool enough for homes where solar heat reduction for cooling is a must. Thermal Lo-E has a low solar heat gain coefficient that blocks the heat of the sun, helping your air conditioning to work at peak efficiency and keeping your home cool inside.

Thermal Lo-E Insulating Glass

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• Outstanding heat blocker • Excellent UV blocker • Unparalleled color neutrality • Superior U-Value

Thermal Lo-E Features:

WARM INSULATORWith Thermal Lo-E, winter blues will be a distant memory. Its low-emissivity (Low-E) rating of .036 makes it a great insulator in winter.Thermal Lo-E works hard in any season to keep your house energy efficient and comfortable.Thermal Lo-E also provides color neutrality and high visible light transmittance, while blocking a high percentage of damaging UV rays.SOLAR CONTROL

Solar Heat and Glare

OUTSIDE 95° F INSIDE

70° F

Inside Air Conditioning

SOLAR ENERGY WAVELENGTHS

Comparing the sun-blocking capabilities of clear glass to Thermal Lo-E

ClearLo-E

SUPERIOR INSULATION

Winter Cold

OUTSIDE 32° F INSIDE

70° F

Inside Heating