I have used your filters for years. I started when I purchased a new Air conditioner for my house. In the last few times I've used them they now make a loud vibration sound. I went from merv 13 to 11 now I'm thinking I should go down to 8. I don't want to I like that they take so much out of the air. Did you change something :thinking:.
Unfortunately, the filter dimensions were not 16x20x4. It was about half inch shorter on two of the measurements. The add did say it was going to be smaller, but I thought that was normal like with 2x4 lumber. However if fit loose in the chamber and did not fit snug like the Honeywell filter I had before. I shelled out my Honeywell filter frame and inserted the Filterbuy filter in it then put in my unit for a snug fit. I will have to go back to Honeywell next time. Also, the box was smashed from FedEx but the filters were ok.