Q: Are ultraviolet (UV) lamps in an HVAC system an effective way to disinfect the air and improve air quality?

A: Jeff May, of May Indoor Air Investigations, in Tyngsborough, Mass., responds: Many of you have no doubt seen UV lamps in HVAC systems. There is a lot of hype regarding these lamps, partly because installers and manufacturers are starting to recommend them as a way to improve air quality and, in some cases, to keep a system clean.

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