I just opened the box that arrived two weeks ago and immediately noticed that it contained two different sized filters. One correct size and five wrong, only reason I ordered them was because actual size was 17-1/2, buy 17-1/2 not 17-3/4 for 17-3/4, so just one of those six is enough. fit and I'm pretty sure they are not MERV 11 as advertised!
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