3M Filtrete Ultra Allergen 2200 Furnace Filter, 20x25x1, 3 Pack

I use these with a box fan to bring cool night air into my apartment, while filtering out the smoke particles from the wildfire smoke being blown into my area. They come in a number of sizes that allow you to open a window to a minimum, and keep the worst of the air pollution out. I use a 20x20 and a 20x25 to cover a 20x45 opening. Once, overnight, the air quality unexpectedly went from mod to unhealthy, and my apartment was filled with smoke. Ran my fan with the filter after closing all the windows, and it cleared it up. I advise all my co-workers to use this method, and filters, to protect their lung health. [This review was collected as part of a promotion.]

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.]