Here's Consumer Reports talking about doing this 3 years ago http://www.consumerreports.org/cro/news/2011/07/why-not-a-do-it-yourself-air-purifier/index.htm ht

Here's Consumer Reports talking about doing this 3 years ago http://www.consumerreports.org/cro/news/2011/07/why-not-a-do-it-yourself-air-purifier/index.htm http://www.consumerreports.org/cro/news/2011/07/why-not-a-do...