
Replaced all three filters in my HPA300 unit. The HEPA fit was a little tight compared to Honeywell's original hardware. This creates some kinking, which I don't see as a problem. The pre-filter is thicker than Honeywell's custom replacement parts, perhaps slightly thinner than the original pre-filter that came with the unit. I've included a picture of the pre-filter against ambient light so you can get an idea of its transparency (filter density). The pre-filter I got from a US pre-filter seller in Bay Area is a little thicker, but you have to cut it open, which is really a hassle. This is a decent value and HEPA filters seem legitimate. One thing I've noticed is that the airflow seems to be a little louder than the Honeywell replacements I've used in the past (as if to say they're stricter). This kit is what Honeywell should be. Sales - not sure why they don't (contact the program people). I'll probably buy them again when the time comes.

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