|Ultra Violet light fades materials such as wall paper and flooring and breaks down fabrics. Ideally, a window would block the damaging UV rays that cause fading, while letting light pass through. Ordinary clear window glass lets in about 70% of the sun’s UV radiation. New varieties of high-performance clear window glass, commonly called “low-e” glazings, provide some protection from UV radiation. Even the best of these, however, still transmit 26% of the damaging UV rays.
NIR = Near Infrared Rays – responsible for solar heat gain