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How Does 
Window Film Block Heat ?

Window films are an increasingly popular solution for reducing the heat that enters a structure through the windows. Solar Window Films are installed on the interior or exterior of glass and can control specific solar rays to decrease heat transmission. This can lead to energy savings on heating and cooling costs and improve the comfort of a building.

The sun heats up homes, buildings, and people by emitting radiant energy. This solar energy comprises of a wide range of electromagnetic waves, including visible light, ultraviolet (UV) rays, and infrared (IR) rays. When these rays reach the Earth's surface, they can be absorbed and re-transmitted by various objects, including windows and skin tissues on the human body. Window film works by disrupting this process. 

Ultra Violet

Visible Light

Infrared

Violet

Red

Green

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Window Film can be made of a multi-layer, ceramic or metallic construction that reflects and absorbs very specific rays, while permitting others. By controlling specific radiation, the films can reject the solar heat gain. Most films offer 99% UV (Ultraviolet) rejection, and some high-performance films offer IR (Infrared rejection) in the 90-97%, while still allowing up to 90% visible light transmission. In this sense, we say that window film is spectrally selective, it is able to "select" specific rays in the solar spectrum and block them. 

In direct sunlight, window films can reduce temperatures by as much as 9° Fahrenheit.

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