I didn't realize but the house has the capacity for a 1 or a 4-inch filter. I did my internet homework and found what I thought was the best-made filter at the best price. I then ordered several for my Daddy (You know it, I am 57 and Daddy's Girl!) He is happy with the filter AND says that he should have been ordering the 4-inch ones all along. Daddy is 83 and still sharp as a tack mentally, his back hurts from arthritis at times and he says that he can tell when his filter has had better days as well from airflow, sound, and particles in the air clogging his nose. He is very happy with these and mom is glad that he is happy!
The Filters are a perfect fit for my furnace and the size of the package was perfect, too , The pleats in the filter provide more surface area for filtration which allows the filter to catch more debris. This makes the air we breathe more purified.
I ordered these before I needed to use them, just to insure that I had them on hand when I did need to install them. I now have enough to last 1 1/2 years.
We were initially using the Merv 8 filters until we looked on the Filterbuy website. After reading all the information, we bought the Merv 13 filters. They were expensive but worth it. Less dusting for me so we will continue to use them and buy them using Filterbuy subscription service!!