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What size flue does a wood burning stove use?

If the stove is not DEFRA approved then it must use at least a 150mm or 6″ flue. A DEFRA approved stove can use a 125mm or 5″ flue. If you are only going to use smokeless fuel and your stove has a 5″ flue then the flue in the chimney can be 5″.

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