Filtrete Premium Allergen & Home Pollutants Air Filter 2200 MPR EA22-4, 20 in x 30 in x 1 in (50.8 cm x 76.2 cm x 2.5 cm)

For those who buy this and don't seem to understand how restrictive these filters can get (higher number=less airflow), here's what you need to know. For furnaces that are 20+ years old, only use UPTO a Merv 8 or MPR 1000 filter, that way the old (or new) blower motor won't be under too much strain and cause issues. If you're furnace is between 10-20 years old, these newer furnaces have much stronger motors and you can safely use UPTO a Merv 12 or MPR 1900 filter without them being too restrictive. Finally, just about anything made in the last 10 years should have no problem running UPTO a Merv 14 or MPR 2800 filter. Something to keep in mind is that this is based on using the most common 16x25x1 filters, if you have enough room to fit a 16x25x4 filter (even if you have to remove the guide bars), then at that point you can safely do Merv 11 or MPR 1200 on a 20+ year old furnace, UPTO Merv 14 or MPR 2800 on 10-20 year old furnace, and UPTO Merv 16 on a furnace made in the last 10 years. As for the very short review of this particular filter, I'd rate it 5/5 stars. MPR 2200 works perfectly on my DIY box fan air filter.

[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!!