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Gas Furnace

Posted by Kathy on March 26th, 2001 08:07 AM

After changing furnace filter, I notice it gets grey/black within 24 hours! This isn't "normal", is it? I've only lived in this house a few months and it is my first home. I'm wondering if the furnace is spewing a fine mist of black dust, as I'm finding furniture covered with a layer of dust just a couple of days after dusting. Furnace is only 4-5 yrs. old. Is this serious?

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