This last spring, I purchased a pkg of 3 2200 Healthy Living filters, changed every 3 mo. or less, and just installed 3rd one.  My allergies to dust, mold, etc.in the house are rarely noticeable now, since I began using this higher filtration filter. (Even on days when it was clear out & I aired out / cooled the house in the early morning hours by opening the windows for an hour or so.)   We also had a terrible year of forest fires, bringing in some days with actual warnings of "unhealthy air".  It was difficult on those days for anyone to breathe outside without using high particulate filtration masks; however, I did not have a single day of smoke smells or allergy reactions while in my home.   I highly recommend this filter to anyone with such issues.  Great job!! [This review was collected as part of a promotion.]