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National Fenestration Rating Council (NFRC)
Standards from the NFRC that establish a rating and labeling system for fenestration products
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The National Fenestration Rating Council (NFRC) publishes a uniform and independent rating and labeling system for the energy performance of windows, doors, skylights and attachment devices. These standards assist architects, builders, code officials, homeowners, governments, utilities and manufacturers in determining the energy efficiency of fenestration products. NFRC standards provide regulatory, prescriptive and system or design requirements.
- Regulatory requirements include referenced test methods and standards (i.e., NFRC), as well as any certification and labeling requirements
- Prescriptive requirements include the fenestration product minimum performance criteria (U-factor, solar heat gain) based on climate zones. In addition, some energy codes provide trade-offs allowing more fenestration area if these products are more energy efficient.
- System or design requirements are typically computational approaches allowing builders and architects to customize buildings and use more and or different fenestration products and still meet the energy code requirements through improvements in other areas such as lighting, HVAC system, or other building envelope components.
- Fenestration product U-factors
- Door systems thermal properties
- Thermal performance characteristics
- Solar heat gain coefficients
- Visible transmittance
- Product air leakage
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