Don't know what's wrong with the last one we got. In just a few weeks, all sorts of dirt settles on the furniture. I went back up to the attic and checked the fit, the gasket around the block, the filter itself, the duct work etc and came up with "bap-kiss" to explain why this one is working so poorly. I won't buy another one so ahead of time next time - now I can't send it back.
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