Furnace flues and chimneys are often neglected. Many homeownerspresume that the utility company or their fuel supplier ismonitoring them, and don't realise this isn't necessarily trueuntil something goes wrong. As a result, bird's nests and otherdebris sometimes cause soot and gases to drift back into thehouse, causing a potentially dangerous situation.
All types of chimneys should have regular, professionalinspection and maintenance. Most chimney sweeps service allkinds of flues, not just masonry chimneys or those attached towood-burning appliances.
The build-up of soot and creosote on flue walls can loosen andfall over time, aided by moisture in the exhaust gases,sometimes filling the clean-out cavity and blocking the flue.Corrosive elements in these gases can affect both metal andmasonry chimneys.
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