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HVAC Dust or Soot Stains Diagnose Soot & Other Indoor Wall or Ceiling Stains Traced to Heating or Air Conditioning Equipment
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HVAC Dust or Soot Stains Diagnose Soot & Other Indoor Wall or Ceiling Stains Traced to Heating or Air Conditioning Equipment
I just noticed these black streaks from a ceiling vent in my apartment I just moved into. what are these streaks and why are they streaks? : r/whatisthisthing
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