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Window Glossary

Window Glossary

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There are currently 2 names in this directory beginning with the letter U.
U-factor or U-value:
Rate of heat flow-value through a building component. U-factor is the reciprocal of R-value.
Ultraviolet light (UV):
Invisible rays of solar radiation at the short-wavelength end of the spectrum. Ultraviolet rays can cause fading of paint finishes, carpets and fabrics, as well as deterioration of some materials.

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