Memphis,
Yes, high intensity UV light does kill mold spores, viruses, bacteria, fungi, etc. But only when they are at low concentrations and when the system recirculates the air over and over again (as in a conventional HVAC system).
Sadly, PVC is well known to grow vigorous colonies of mold and mildew. I have a very nice, formally white PVC fence that grows mold quickly - and it is not even in the dark!
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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