I was a little leary in ordering the size I did as it wasn't the exact size as was on my old filter. I called the company # and was told the size I ordered would fit my furnace. They were correct. It fits perfect and the service was excellent. Got the filters in two days.
The construction is just okay, usually there is one area that is not sealed.What is concerning is that after 10 days to 2 weeks, the filters starting putting off an unpleasant odor. Replacing the filter stops the odor but because these filters are custom made, replacing the filters so frequently is costly.