
I used to buy a replacement for our air filter from another brand (which I won't mention) and it was so bad that when you removed the felt they fell out pre-filter. You will see dust collect around the edges where the air flows AROUND the paper filters. It was very disappointing. When I received them, I held my breath as I put them in, hoping I wouldn't have the same problem. They fit perfectly! The pre-filter fits better than what was there and covers a larger area. I have purchased Flintar filters for my Pure Air Purifier and have always been happy with them. I will never buy anything other than this famous brand ever again. Definitely recommend!

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