Can you have bends in a wood burner flue?

Bends in the chimney should be avoided, according to both the Building Regulations and British Standards, since a straight vertical chimney is much better at removing combustion gases.

If bends are unavoidable, then there must be no more than four bends in the length of the chimney.

A bend should be no more than 45 degrees from the vertical, with the exception that 90-degree factory-made bends or tees may be treated as two 45-degree bends.

Where available, you should use the standard offset components available from the chimney manufacturer, when using systems such as twin wall.

Flexible chimney liner has no bend components as it can be bent to suit.
The gap between bends on stainless steel chimneys must not exceed 20% of the total chimney length.

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