The Fellowes AP-300PH seems to be a well made product. I purchased both the 300 and the AP-230PH. The smaller for our bedroom and the larger for our living/dining/kitchen area. We were having terrible upper respiratory problems for a year and a half and finally discovered two leaks in our roof that have produced mold in in the attic above our bedroom and in the walls or our dinning area. We haven't had the upper respiratory problems since we installed them 3 weeks ago. We'll see how it goes. We look forward to the lord of the land fixing the problems soon. We like both filters. They're quiet enough for us and seem to work as advertised.
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