Skylights

Modified on Thu, 15 Feb 2018 at 12:32 AM

Skylight 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

*Input may be U-Factor or R-Value depending on user settings.