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Old 05-23-2013, 06:02 PM   #1
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Ice Build-Up on Chimney


What is causing the ice build-up on the chimney? This year it was extremely bad -- a 9-inch by 9-inch chunk came rolling down the roof. We have a Lennox Conservator III - G16 bought in November of 1984?

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Old 05-23-2013, 07:05 PM   #2
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Ice Build-Up on Chimney


When U C smoke coming out of the chimney it is MOSTLY water vapor and condenses on the coldest available surface. Voila your chimm knee kap. You don't live in the Great White North do U? Happens all the time here. We had a severe Winter where I am. 150% more snow and cold than usual. Did you know the ventor/smoke exhaust fan for that unit is almost obsolete? Some versions of it are obsolete. I would start looking for a new furnace in the future.

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Old 05-23-2013, 07:14 PM   #3
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Ice Build-Up on Chimney


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Old 05-23-2013, 07:51 PM   #4
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Ice Build-Up on Chimney


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Originally Posted by Bdfour View Post
What is causing the ice build-up on the chimney? This year it was extremely bad -- a 9-inch by 9-inch chunk came rolling down the roof. We have a Lennox Conservator III - G16 bought in November of 1984?
Kind of late in the year now. It is Summer in most parts of the North America Continent. Helps to post your location.
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Old 05-23-2013, 08:03 PM   #5
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Ice Build-Up on Chimney


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Originally Posted by yuri View Post
When U C smoke coming out of the chimney it is MOSTLY water vapor and condenses on the coldest available surface. Voila your chimm knee kap. You don't live in the Great White North do U? Happens all the time here. We had a severe Winter where I am. 150% more snow and cold than usual. Did you know the ventor/smoke exhaust fan for that unit is almost obsolete? Some versions of it are obsolete. I would start looking for a new furnace in the future.

Soon it is mozkuitoe season here. Big as Crows they are. Our Provincial Bird.
I really appreciate your answer. (In the past, I would have guessed you were from Minnesota, but here in southern Minnesota, we're not the Great White North like we used to be. We still have a good number of mosquitos though.) From other internet research, I had thought maybe the flue size was the problem or else the height of the chimney; however. an experienced HVAC person told me today, that the flue was not the problem and neither was the height of the chimney. Your answer sounds right because apparently the chimney air isn't being forced out fast enough to escape the chimney area and it condenses and freezes as soon as it hits the cold air. I'll get that exhaust fan checked. Thanks for the forewarning of the difficulty I might have if it needs replacement. P.S. Today, I came across an answer to another question someone had asked, and I thought that answer was a good one. It had smiley faces and interesting word choices too. I bet it was yours also. Wish I would have remembered to check the name for future dependable answers!
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