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What are these ugly black lines and blotchy areas around my register vents?

April 26, 2017areas Black blotchy REGISTER ugly vents

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What are these ugly black lines and blotchy areas around my register vents?

1 Answer

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Its called air pollution and its getting worse every year. People say, it didnt happen in my last house but their last house wasnt all closed up like a mason jar either. Sick building syndrome does not just apply to office buildings. Fortunately, there is a fairly simple solution.