Great filters, but not for shallow returns
I have a nice, square return so this doesn't protrude far back enough to cut off flow, so it's great for me. Just make sure your return is deep enough to allow airflow freely. Otherwise, it's a great filter. I replace it every 45 days or so owing to the fact that I have 5 dogs in the house that are constantly tracking in red clay dust. This also captures all of their dander, so it starts to smell bad after a while. But, that's not the filter's fault - rather a sign that it is capturing everything. I've been through several of these and have zero complaints.
Rating: 5 stars