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Why do the UV devices when mounted in the supply kill mold and when mounted in the return kill airborne bacteria?

April 26, 2017Airborne bacteria Devices kill mold mounted Return supply UV

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Why do the UV devices when mounted in the supply kill mold and when mounted in the return kill airborne bacteria?

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Mold has a much higher kill threshold than bacteria and requires a longer exposure time to UV in order to be killed. Because of this it is very difficult to kill mold spores while airborne. When on the surface (and immobile), exposure time is unlimited, and the mold is easily killed.