Generally, window film provides specific personal and property protection from the effects of the sun as well as added safety and security in the events that result in broken glass.
Professionally installed films look better longer and are usually more likely to perform to specifications for their warranted lives, or even longer, than those improperly installed.
Professional dealer / installers have the resources and recommendations from their window film manufacturers to use in assisting customers in selecting the correct film for the particular windows and also can specify the product benefits desired by that customer.
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Total Solar Transmittance - The ratio of the amount of total solar energy in the full solar wavelength range (300-2,100 nanometers) that is allowed to pass through a glazing system to the amount of total solar energy falling on that glazing system. Value is usually expressed as a percent.