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Gravity Furnace/Black Film on Walls

Posted by Judy Whitaker on February 9th, 2003 03:34 PM
In reply to Gravity system replacement. by Harold Kestenholz - Hydronic Network on September 14th, 2000 12:22 AM [Go to top of thread]

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I have a gravity furnace in a rental property that has an upper and lower unit. Just recently we noticed a black film on the walls. Any ideas on what could be causing this black film? The funace is inspected every two years and the inspection has been done within the last 6 months. The black film is in the upper and lower unit however, it seems to be worse in the upper unit. Any suggestions would be appreciated. PLEASE HELP! Thanks.

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