We just got a filter that was in for a year and a half. It was put in in February of 2011 and the owner forgot to remove it and took it out just a couple weeks ago. And this is a doctor in Seattle, and it’s the highest concentrations we’ve seen in North America are in this guys HEPA filter. It would have been in the house if not for the HEPA filter.
Published: July 7th, 2012 at 9:31 pm ET