Are there any recommendations on the effectiveness of in-duct Ultraviolet Air Purifiers on the market. What should I look for when purchasing one, and what brands stand out? I am currently looking at the Sanuvox and Honeywell brands.

They are good brands and will turn the small living creatures that pass through the ductwork into dead dust as they pass by the light. As the dead dust settles downstream from the light into the long, dark passages of the duct, the dust will be a good medium for other microbes and mold to grow upon.

My son installed one in his house and his allergy problems were greatly improved. He sleeps better now. Make sure it has a good filter to catch HK's "dust".

Ah, yes. So the UV light should be in the return air stream so the dust can be caught by a good filter instead of passing into the supply duct.

heh funny dude!

You might want to compare the Honeywell with the CaluTech models, they are equivalent in power and use the same ultraviolet light bulbs, but their warranty is better (10 years) and they're made in USA, I think in Illinois. The site is www.calutech.com and I attached an image from the Google image search for reference. It's under $500, and I got mine with a coupon code I got from retailmenot.com which gave me about $160.00 off the price (and shipping was free!).

Which is funnier- catching the stuff the ultraviolet kills in filters or blowing dead matter out the supply side so the kid coughs?

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Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.