These filters are great and do the job well. They have a training cardboard frame and are securely attached. This helps the filter trap any dirt that gets through. I have bought these filters twice already (16x20 and 20x30) and will keep buying them until I find that they no longer work properly. I would recommend. A NOTICE. One of the "evaluation functions" listed relates to the packaging. I am rating this ONE STAR as the standard packaging used to ship these filters has resulted in filters being shipped with various forms of dents or creases. understand why, because that's one of the things they ask for a review for. Anyway, that's why I've added my comments to keep the low rating. Thanks very much!
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