What is the Solar Heat Gain Coefficient (SHGC)?

The fraction of solar radiation admitted through a window or skylight, both directly transmitted, and absorbed and subsequently released inward. The lower a windows solar heat gain coefficient, the lower solar heat it transmits, and the greater its shading ability. More.

For the impact rated doorlites and decorative doorlites tests to measure SHGC are currently impossible to conduct. As testing laboratories develop test methods for these products we will get the appropriate data. For now, use the default value.

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