I ordered a box of 6 Nordic Pure 14x24x1, Merv 12 / FPR 9 filters. None of the 6 filters has a seal or label with these characteristics. or even the part #. The oversized 6 filter box was for the Merv 12 only. The box could hold 1 or 2 more filters. As far as I know the Merv 12/FPR 9 filters I ordered have been replaced with a smaller unmarked filter. My main point is that the specs/specs. must be printed on each filter. That irritant aside, the filters appear to be well made and sturdy. They fit perfectly in the filter holders of my system.
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