“Total Solar Energy Rejected (TSER)—On Angle” & “IR Rejection”
1. “Total Solar Energy Rejected (TSER)—On Angle” is not an industry-accepted measure of a film’s performance and therefore cannot be used to assert the superiority of one film product over another. The NFRC is the only independent agency to rate window performance, and
“Total Solar Energy Rejected (TSER)—On Angle” is not recognized by them as a measure of performance.
2. All film products, indeed all glazing systems, have improved “total solar energy rejection” as the sun climbs higher in the sky and sunlight strikes a vertical glass window less directly. When the sun is directly overhead, all vertical windows (with or without film) have 100% total solar energy rejection.
3. Sunlight (solar radiation) is made up of 2% ultraviolet, 49% visible light, and 49% infrared energy, and ALL of this energy generates heat if it enters a room through a window. Blocking 97% of the infrared would NOT block 97% of the heat, but only 97% of 49%.
4. No window film, in fact, blocks 97% of the sun’s infrared energy. Blocking 97% of the infrared at a single wavelength does not mean that all the other wavelengths of infrared are being blocked at that level. Be skeptical of metering devices that selectively measure at very narrow wavelength bands, for they can falsely represent the whole picture