GUIDE SPECIFICATIONS - SECTION 08520

The NFRC certified whole window U-Value based on NFRC 100 test sizes and calculated by using Windows 5.2 and Therm 5.2 software (or newer version), shall not exceed 0.32 BTU/hr/sf/degF. All values submitted for comparison shall be calculated using manufacturers standard two pane insulated glass unit with center of glass U-value of .25 BTU/hr/sf ... ................
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