20x21x1 (Actual Size) Accumulair Diamond 1-Inch Filter (MERV 13) (4 Pack)
We have been using this brand for a while in our home and we love it. We have allergy issues in the home and this was recommended to us.
I don't know I don't love it that much but it works. I would say it works just like any other one, there's nothing special about it.
Q & A