Why Is My Furnace Filter Black?
Checking your furnace filter only to find that it has turned completely black is alarming, to say the least. Though it does occur, this isn’t normal. A black furnace filter indicates that something is amiss in your system or home. Here are some of the probable causes. Potential Reasons for a Black Furnace Filter Carbon Monoxide Carbon monoxide is an odorless and invisible gas that originates from incomplete combustion. It is known to commonly cause soot deposits on the furnace filter, which could be one of the reasons why
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