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High Performance Glazing/Glass
Offering Comfort & Safety For Today's WinDow & Doors
An NFRC label on the window will contain the information regarding the glazing features of a window - U-value, Solar Heat Gain Coefficient (SHGC), and Visible Light Transmittance (VT). Generally, the lower the U-value, the better the window performs at preventing heat loss (or gain in hot climates). U-value is equal to the inverse of R-value. SHGC is the fraction of sunlight which is admitted through a window and released as heat indoors. It is expressed as a number between 0 and 1-- the higher the number, the more solar heat the window transmits. VT is the portion (between 0 and 1) of the sun’s visible light that is transmitted through a window.
NFRC GLASS PERFORMANCE OPTIONS By Whole Product Performance
Window technology has evolved over the years to the point where windows can be selected not only for their aesthetic qualities, but also for their performance abilities. For example, windows can be made from laminated glass that resists impact from flying debris in hurricanes, have special coatings that control the amount of heat gain and loss, or prevent water spots and dirt accumulation.
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