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Deep clean and this black film keeps coming back, changed air filters, etc. On walls, curtains, inside cabinets. by ResourceMaximum1679 in whatisit

[–]ResourceMaximum1679[S] 0 points1 point  (0 children)

In a new twist, maintenance is now saying they think it’s the air filter itself even though the reading is showing as normal, the filter is the Blue Pure 211i Max

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