I bought this 20" x 20" filter but it is slightly shorter by 1/4" to 3/4". I'm not sure if it's due to shrinkage or what. But the material seems learned and finds it difficult to hold its form like a filter. Although I'm not sure if he's non-allergenic. I used it to cut into smaller pieces; while forming small particles. Would I buy again, can be expensive from a certain size. It's probably better to buy a large piece and cut it to fit your needs. Not too difficult to cut despite the hardness of the material.
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