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Originally Posted by TeeSter
Hmmm... it didn't seem to make that big a difference to me. Even with the filter I rarely have my fan above 2.
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Interesting. Made an enormous difference to me. I don't know what the rating of this filter is, but it's mighty effective, and lets very little air through. Filters are always a trade between air flow and efficiency, and Ford has obviously opted for a tight filter. It may well be that the aftermarket ones may vary in porosity. (The YMMV effect.)
Anyway, for those who might prefer air flow, there is even an alternative to the furnace filter option. The filter compartment in my car (2006 FEH) is sized for a 6x10 filter (actual dimensions 6 1/4 x 10 1/2 inches), and my local hardware store sells the spun fiberglas material for $3 per running foot, from which one could cut out a half-dozen filters. I cut one to fill my compartment, and it works just fine. (I think that Home Depot also sells the material.) Open up your compartment, measure your own dimensions, and you can have a filter to suit your personal needs.
Hal