There is a white powder looking substance builtup on the joints of the furnace ducting. Can anyone tell me what it is and if I should be calling someone to fix this issue. Is this normal or not?
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There is a white powder looking substance builtup on the joints of the furnace ducting. Can anyone tell me what it is and if I should be calling someone to fix this issue. Is this normal or not?
Not normal but I would have it checked out.
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