They seem to work really well. It's a bit difficult to quantitatively judge just how well they do without specialized equipment, but my wife says that she gets very little dirt when she dusts. They may seem high priced, but if a person changes say, a Filtrete 1-inch filter, once a month then the total cost would be more than using the 4-inch ones, which last a year under normal use. Plus, you only have the hassle of changing them once a year instead of once a month.
They don't look particularly well-made, but they're strong enough to get the job done.
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I've never had any problems with these filters until recently. I bought two of them in early December and within the month, both seemed to be having extreme difficulty letting air flow through even though there was no visible dust build-up on the filters. I just noticed that my heater/ac was much louder and running more often and when I checked the filters, there was extreme pressure pulling on them. $80+ on filters in one month is outrageous. Went back to a $20 Filtrete and will see how that does. Seems to be much better for now. Will probably never buy these again.
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