1) UV Air Purifiers destroy bacteria therefore the mold has no source of food.  Without a source of food, mold will quickly be destroyed.

2) How does the UV light slow the bacteria down so it can receive the UV dosage need to kill it?  The turbulator slows, twists, and mixes air around the lamp, dramatically increasing the time the contaminants are suspended in front of the lamp.  If you slow it down the air contaminated can be "burned" by the UV Energy.  The more time in front of the lamp, the higher the UV dosage the contaminant receives, and the higher the kill rate.