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ghosting on the ceiling,air fliter black,windows and floors black

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asked in Interior Walls by john-mclaughlin (130 points)
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1 Answer

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Hi John,
There might be several reasons but without having any information about your location / surrounding area, house structure, mechanical systems, their age, occupant’s behaviors etc., I can’t really tell you much. 
and previous Q&A in Interior Walls Category: http://checkthishouse.com/qa/questions/interior-walls  and start investigating. 
answered by darekrudy (21,730 points)