Dale, no offense to you, and the filter may be the greatest thing since slice bread, but I find this kind of site offesive. I see a whole page of vague claims but no objective information outside of the price. For any who are not aware of it there is a well established test standard, ASHRE 52.1-1992, for testing filter effectiveness. If this filter is so good why not present some objective data before asking me to plunk down $45. I just saw a filter at a local home store, for $20 that removes 90% of particulate from .245 to 80 microns per the above mentioned test. It was only guarnteed for 3 years, but at least I know what it will do.