These filters are exactly as the manufacturer describe. I could tell the difference in the air quality and freshness right away. My headaches and allergies have subsided. Thank you
I found an odd sized filter that neither local, large, home improvement store carried. Plus, it's not like I live in the country. I'm outside of Washington DC, so clearly, it's not a common size. Anyway, the filter was good quality, and I received it the next day.