The filter was cut down from a larger size filter and not 100% accurate on the dimensions. Also the one side of the filter material is not sealed to the cardboard frame, therefore air can pass through the gap as not filtered.
I have to say this was the easiest process to get a new filter for our A/C unit. I had waited for my husband to take care of this, but you know how that goes, then one day I saw the FilterBuy ad and decided to call and order. One thing you do need to do is make sure you have the correct size when ordering, my first attempt was my mistake - too small. But the folks at FilterBuy were so helpful when I called them and quickly corrected it for me and within a few days the correct size one was there. My only wish is that they also installed them, had to wait a few more days for the hubby to install it, but when he did it fit like a glove and I will definitely be calling them to set up a replacement schedule for the filters. So glad I tried them, and others will be as well. Keep up the awesome work.