The Canon RS-FL01 Replacement Air Filter is designed for the REALiS WUX4000 / WUX4000 D projectors. A clean air filter positively affects the life span of the lamp as well as protecting the internal working parts of the projector against debris, dust and other contaminants.
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Filters were needed for our two Canon Projectors at church and the price was reasonable based on my research. The only down side was the length of time to get these as there was a back order with the supplier. B & H was good about letting me know of the delays and that I was not being forgotten.