These things are amazing compared to my regular filter. The frame material is very durable, almost like plastic. I can't tell what it is, but it's not the flowable brown sludge typical of filters. I've struggled with filters in these flimsy cardboard frames for so long that I was just shocked at the clean lines and strength of these 20x20 frames. Thanks to the excellent frame, these filters do not bend. Vacuum in the middle or on the edges. They stay true to the opening and do a great job of filtering. I can say they will work better just because they fit. They also look like the best filters.
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