DO NOT SPEND YOUR MONEY ON THESE FILTERS! I made a purchase through Revain as suggested by previous buyers hoping to receive a legitimate product. Instead, I paid a premium for absolute rubbish. One set of filters has vertical "wrinkles" and the other has them horizontally. (See attached pictures). I am by no means a ventilation specialist. However, to my knowledge, the orientation of the filter material affects the efficiency of the filter as well as the performance of your overall heating and cooling system. Therefore, arrows are always printed on the filter and detailed instructions on the packaging that make this clear! It looks like they're either fake, cheaper 3M filters that someone repackaged to look like the real 2800, or someone is selling fake factory junk.
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