Here is the final installment of products seen at the 2004 AHR Expo.
Having worked in the indoor air quality field in the past, I have many times wished for a HEPA air filter system that I could install as a replacement for the standard filter rack that you find in office lay-in ceilings. When trying to sell a project to improve the air quality in an office building (for example), all I could find a few years ago was (almost) HEPA filter boxes that had to be installed in the return-air ductwork. This not only added installation expense to the job, but it made replacement of the filters difficult. So I was interested when I noticed the Q3-400 Ceiling Filter System from HEPA Corp. (Anaheim, Calif.) at the show. Of course, because HEPA filters have greater pressure losses, they require more area than standard filters, but that manufacturer seems to have all the necessary hardware covered.