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Why is there soiling or darker areas around the edges of my carpet or near air ducts?

April 26, 2017air areas carpet darker ducts edges near soiling

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Why is there soiling or darker areas around the edges of my carpet or near air ducts?

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Carpets may show increased soiling around the edges of a room, under doors and near air ducts. This is called soil filtration or fogging and is caused by the carpet’s pile fibers filtering out dirt particles from the air blowing under skirting boards or doors, or from air ducts.