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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