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1/4"
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3/8"
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1/2"
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5/8"
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3/4"
U-Factor: is a calculation that describes the rate of heat loss. A window with a lower U-Factor has greater resistance to heat flow and a better insulating value. Note: United States uses inch-pound imperial values (IP) and other countries use metric values (SI). (Conversion is IP multiplied by 5.678, or SI divided by 5.678.).
Solar Heat Gain Coefficient (SHGC): is the total amount of direct solar heat entering the room and indirect heat gained from absorption in the glass. A value of 1 is 100% gain, 0 is total blockage.
Visible Light Transmittance: is a percentage of the visible light spectrum that passes through the window into the room's interior. A higher visible transmittance is desirable for maximum daylight.
Fade Transmission: is a weighted calculation using UV and visible light (also called Tdw-ISO). A lower number means better fading protection to interior objects like carpets and furniture.





















The measure of an energy-efficient window is one that provides thermal comfort throughout the seasons of the year. Geographic location and window size are attributes that should be considered in order to select a glazing package that balances the need to keep rooms warm in the winter and cool in the summer.