packaging. . The box is probably worth more than the filters. 2) The size of the filter is slightly smaller, for example the 3m filter I replaced fits snugly in the filter frame, they don't, making replacing on the ceiling an act of juggling (or sticking it on) . on site) is a stupid waste of time. 3) I waste my time returning them, waste my time using them. 4) Overall quality of materials and clutter is much lower than 3m - yes 3m is more expensive but now I doubt the filter will actually reach the advertised MERV level.
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