GeorgeT- the filter you are buying from Sweetbay is probably only a one inch thick filter while the true high efficiency filters are 4-5" thick. They are made in an accordian style so you get a helluva lot more area of filter- thus they'll last a lot longer than the 1". I don't recommend buying the 1" thick "high efficiency" filters to my customers unless they're prepared to replace them once a month. There just isn't enough filter area in them and they're too restrictive.
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