I bought these to save $20-$30 on OEM filters and so far I'm happy. The materials appear to be of the same quality as the originals, the cardboard frame feels as thick and rigid as Carrier brand filters. Deflection in creases near the outer edges but leaves no gaps so fit or function doesn't appear to be compromised. As you can see in my third drawing, they seem to have fixed the missing guide arrows. which other reviewers have pointed out.
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