Sierra Pacific Windows - Interpretations

INTERPRETATIONS:

Term	Definition
U-factor	U-factor measures how well a product prevents heat from escaping. The rate of heat loss is indicated in terms of the U-factor (U-value) of a window assembly. U-factor ratings generally fall between 0.20 and 1.20. The insulating value is indicated by the R-value, which is the inverse of the U-factor. The lower the U-factor, the greater a window’s resistance to heat flow and the better its insulating value.
SHGC	Solar heat gain coefficient (SHGC) measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. SHCG is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits.
Vt	Visible transmittance (Vt) measures how much light comes through a product. The visible transmittance is an optical property that indicates the amount of visible light transmitted. Vt is expressed as a number between 0 and 1. The higher the Vt, the more light is transmitted.
CR	Condensation resistance (CR) can range from 1 to 100. The higher the number, the better the resistance to condensation formation on the glass, sash or frame.