To prevent fading damage to the interior furnishings and to reduce the need for air conditioning, there are glazing options for windows and doors that block UV radiation. There are myriad different types of glazing and films that can be added or specified for windows providing differing properties for desired performance. At a minimum, the energy code’s values for window transmittance (U-value) and the solar heat gain coefficient (SHGC) offer some UV protection. If more UV blocking is necessary, films adhered to the glass will provide this additional UV and/or SHGC protection.