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Update: After seeing a dozen homes in Charlotte with the same creosote buildup pattern, I realized most folks think a cold chimney draft is good, but it actually accelerates condensation and makes the glazed stuff way harder to remove.
I confirmed it by checking the flue temps with my probe before and after a cleaning and seeing the difference a proper damper setting makes, so what's the biggest draft-related issue you've had to explain to a customer?
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