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-   -   Ash on furnace filter (https://www.askmehelpdesk.com/showthread.php?t=179804)

  • Feb 2, 2008, 10:09 PM
    mbrady
    Ash on furnace filter
    I notice that during this cold winter at Edmonton that my gas furnace filters contain a larger amount of a whitish colored ash on the cold air return side of the filter. I would like to know where this ash is coming from. The air quality in the house seems fine so I cannot see how the ash is coming from the cold air returns. Could the ash indicate a leak in the heat exchanger?

    My gas furnaces are mid efficiency ICG Ultimate II (17 years old)

    Regards,

    Michael Brady
  • Feb 3, 2008, 09:10 AM
    hvac1000
    What you call ask could be anything. Is your dryer in the same room as the furnace?
  • Feb 4, 2008, 09:09 AM
    mbrady
    No, the dryer is in a separate room. I think I might know what it is. It may be accumulated calcium carbonate blowing off the screen of the flow-through humidifier when it is dry. The humidifier is attached and blows into the cold air return. Does this make sense?
  • Feb 4, 2008, 02:00 PM
    hvac1000
    I would send a sample to a testing company if you really want to know what it is.

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