Window and Glass Door Library Help
| U-factor* |
Thermal transmittance factor as rated by the National Fenestration Rating Council (NFRC). All U-factors are in I-P (US) units: Btu/(h-ft2-F). |
| R-value* |
Thermal resistance factor (inverse of U-factor). All R-Values are in I-P (US) units: (h-ft2-F)/Btu. |
| SHGC |
Solar Heat Gain Coefficient as rated by the NFRC. This value must be between 0 and 1. |
*Input may be U-Factor or R-Value depending on user settings
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