Understanding Glass Performance
The National Fenestration Rating Council (NFRC), a nonprofit organization, has defined labeling requirements for windows and doors. This information is provided to help you choose the best product for your home. Under the program, products are independently tested, certified and labeled, so you can be confident they will perform the way they are advertised. And as you will see, the ENERGY STAR program uses U-Factor, Solar Heat Gain Coefficient and Air Leakage to qualify products for certification.
Solar Heat Gain Coefficient (SHGC)
Visible Transmittance (VT)
*As of January 1, 2015, the lowest allowable rating for Air Leakage on the NFRC label for windows and sliding doors is ≤0.3. Sunrise Windows are designed and manufactured to deliver superior air leakage performance. Actual ratings as tested are provided by window type on the following pages.