NFRC Ratings

NFRC ratings for both non-impact and impact products include U-Factor, SHGC (Solar Heat Gain Coefficient), VLT (Visible Light Transmittance) and CR (Condensation Resistance) values for a variety of glass types and divided light options. The corresponding Energy Star zone is also included. 

    Non-Impact
    Impact

                      

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2009/2010 Energy Tax Credit?  Learn more.