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In page Daylight redirecting film:

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Daylight redirecting window film was initially made of one redirecting film and one glare-reducing diffusing film, often located on different interior surfaces of a double-glazed window,[2] but integrated single films are now available.[4] Due to the prism structure, it works only at certain angles. By making DRF blind, you can always keep the same effect. Add UV blocking filters to the film to block harmful UV rays.