What is NFRC? What is NFRC? NFRC is National Fenestration Rating Council – the American body which manages the performance ratings of various glass types. w Need some help? Click here or call us0800 847 434 Find a Branch Get in Touch People who asked this question looked at these questions as well AllRich Snippet's How To Inspect Glass? What is Double Glazing? What is EN673? What is the R value? What is Toughened Glass? What is Tempered Glass? What is STL? What is STC? What is Solar Heat Transmission? What is Solar Control Glass? What is Soda-lime Glass? What is Security Glass? School Glass What is Safety Wired Glass? What is Safety Mirror? What is Safety Glass? What is the cost of Retrofit Double Glazing? What is NFRC 100? What is NFRC? What is Low E Glass? What is Liquid-Pour Laminated Safety Glass? What is Laminated safety glass? What is Laminated Glass? What is IGU? What is Argon gas? What is Annealed Glass? What is a U Value? See all FAQs