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    mbrady's Avatar
    mbrady Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Feb 2, 2008, 10:09 PM
    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
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 3, 2008, 09:10 AM
    What you call ask could be anything. Is your dryer in the same room as the furnace?
    mbrady's Avatar
    mbrady Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 4, 2008, 09:09 AM
    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?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Feb 4, 2008, 02:00 PM
    I would send a sample to a testing company if you really want to know what it is.
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