The National Fenestration Rating Council (NFRC) is the trusted, independent, nonprofit certification body for the energy performance of windows, doors, and skylights. With more than 35 years of expertise, NFRC is the standard-bearer in fenestration performance certification, providing the public with objective data that helps stakeholders make informed decisions about product and building performance. NFRC certification ensures that products are tested using precise, scientifically validated methods, resulting in ratings that are fair, accurate and credible. Contact us at info@nfrc.org.