Our #CorsiRosenthal box after 52 days of use. It looks too me like these filters are already all used up. Certainly if these were in my furnace I would be replacing them. I understand that CR boxes are supposed to last a year. I don't think this one has effectively lasted much more than a month. The smokers in the house are killing it. #CorsiRosenthal #corsirosenthalbox #corsirosenthalairfilter