Visible Light Transmission
Visible Light Reflectance
Total Solar Transmission
UV Light Rejection
Total Solar Energy Rejection
Performance data is based on this film applied to 3mm clear glass. All data calculated using the definitions and equations in ISO9050 & ASHRAE Handbook.
BTU METER AND INFRARED LAMP
The British Thermal Unit (Btu or BTU) is a non-SI (Non-International System of Unit) defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius.
Heat is now known to be equivalent to energy, for which the SI unit is Joule; one BTU is about 1055 Joules. While units of heat are often supplanted by energy units in scientific work.