Works as advertised. It's a filter and it does the job. My problem is that in strong dusty winds and dusty winds (Santa Ana winds in California) the life of the filter is about 6 months and it is expensive to buy. I run my system (fan) on low for about 12 hours a day, which pulls fine dust in the house into the filter, which of course causes the filter to fill up. I plan to change the filters at least every 6 months as the air in the house is much cleaner which reduces particle allergies.
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