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Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more.
Version 7.0 brings the most stringent criteria ever with a Northern zone U-Factor of ≤ 0.22 for windows and ≤ 0.26 for patio doors. Also in the Northern zone, for the first time, there is a minimum Solar Heat Gain Coefficient (SHGC) requirement for windows of ≥ 0.17.
Using the U-Factor data, the R-Value can be determined. The R-Value is the thermal resistance of the window or patio door glass to heat flow. The higher the R-Value rating, the more energy efficient the unit is.
Andersen windows and patio doors are NFRC certified, and labels list performance data, including U-Factor, SHGC, visible transmittance, and air leakage. U-Factor Considering this measure helps you understand the insulation value of a window.
by Andersen® windows recognized as the Most Efficient of ENERGY STAR® in 2021. The products meet the requirements shown in the table below. NFRC ratings are based on modeling by a third party agency as validated by an independent test lab in compliance with NFRC program and procedural requirements. This data is accurate as of February 3, 2021.
4 Values are based on comparison of Renewal by Andersen® double-hung window U-factor to the U-factor for clear dual pane glass non-metal frame default values from the 2006, 2009, 2012, 2015 and 2018 International Energy Conservation Code "Glazed Fenestration" Default Tables.
Andersen® windows and doors are tested to determine National Fenestration Rating Council (NFRC) certified glass performance ratings. To view links to all current performance rating tables, see our Technical Documents . Select the document that matches the window or patio door Series.