Checking your furnace filter shouldn’t be a scary undertaking. However, you may feel a little concerned if you notice that the filter has turned black. Since the filter collects and traps dirt, dust and other debris, it won’t maintain its original pristine condition for long, but a pure black filter is a bad sign. Here are some reasons why it might look that way. Carbon Monoxide Can Change the Color The main problem to worry about is carbon monoxide, which can change the color of a filter to stark black. Regardless of the reason for it, there is nothing good
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