Definitions...


Shading Coefficient

(SC) The ratio of solar heat gain through a glazing to the solar heat gan through a single lite of 1/8" (3mm) clear glass. The lower the number, the better the glazing is at preventing solar gain. Source: Cardinal

Solar Heat Gain Coefficient

(SHGC) The amount of solar radiation which enters a building as heat. The lower the number, the better the glazing is at a preventing solar gain. Source: Cardinal

Emissivity

A measure of a surface's ability to emit long-wave infrared radiation of room temperature radiant heat energy. Emissivity varies from 0 (no emitted infrared) to 1 (100% emitted infrared). The lower the emissivity, the lower the resultant U-Value. Source: Cardinal

UltraViolet Light Transmission

(UV) The amount of UltraViolet Light Transmission in the solar spectrum that is transmitted through a window which can cause fading. The lower the number, the better the window system is for reducing fading potential of carpets and interior furnishings. Source: Cardinal

Damage Function

The amount of UltraViolet Light and Visible Light Transmission which is transmitted through a window which can cause fading. The lower the number, the better the window system is for reducing fading potential of carpets and interior furnishings. Source: Cardinal

U Value

This represents the heat flow rate through a window expressed in BTU / hr / ft^2 / F. using winter weather conditions of 0 degrees outside and 70 degrees inside. The smaller the number, the better the window system is at reducing heat loss. Source: Cardinal


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