
Carbon technology seems to improve air quality, although there are some caveats about the product: the cardboard perimeter is thinner than my previous (OEM?) filters, which can be an issue during installation, and an inner filter less densely packed than my previous filters, ie more space between the ribs. This manufacturer seems to skimp on building materials and filter paper area, which doesn't give me 5 star satisfaction. Right in the middle for now. Let's see if I have to replace these filters more often than previous filters of better design.

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