This size (14x18) is hard to find in my area. Those in the hardware store Orange Big Box with a rating of 12 or higher seem to miss everything compared to these. They're strong, wire-braced, and only flex when the filter is so clogged that the A/C is having trouble "breathing" and is about to rupture anyway (it's long overdue to change the filter). Our complex is 4 years old. . We put the vacuum cleaner in the closet with the air conditioner, where there is relatively little dust. However, we go through a filter every 4-6 weeks. So some may get 3 months from each filter. We are not.
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