The ultra-fine filter is made of a rubber frame which is much better than a hard plastic frame!
I have used cpap for over two years now. I have experienced several types of filters for my Dream-station from Phillips and have discovered the ultra-fine filter is made of a rubber frame which is much better than a hard plastic frame! This is exactly what the original equipment uses. The plastic frames do NOT seal properly and cause the ambient air to by-pass the filters. This is very good quality material at a price that can't be beat! I do recommend this product!!
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