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i was working on an 80% furnace that is abount 12 years old and noticed white, almost calcium type substance, forming at every joint of the flue pipe that runs from the stack to the furnace.the main stack is double wall b vent and the pipe that runs to the furnace is single wall.there is no rusting or signs of this white material on anything but the joints and seams of the 90's.i have serviced this furnace every year for the past ten years and have only noticed this build up the past two years.it is a 110,000 btu/in. furnace vented in 5" pipe.do you have any idea what could be causing this condition?any assistance you can provide would be much appricated.thank you
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