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Stainless Solutions

IMOA’s »Stainless Solutions« e-newsletter covers a different stainless steel issue each month, with tips on design and specification, and links to technical resources.

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Ductwork/Flue Systems

Stainless steel chimney liners and flues are used for wood burning stoves and oil and gas furnaces and boiler systems. The combustion products of these fuels are very corrosive and stainless steel flues are often required in the building codes. This makes stainless steel an appropriate choice for both new construction and for relining old chimneys. Long lasting stainless steel liners help to reduce fuel costs, ensure that fumes are properly vented, and limit chimney deterioration over time. Unlike aluminum, stainless steel is capable of withstanding higher temperature chimney fires.

Flexible liners are inserted in existing chimneys while pipe is used for new construction. Type 304 and 304L (S 30400, S 30403, EN 1.4301, 1.4307 or SUS 304) do not provide sufficient corrosion resistance, particularly in flexible chimney liners. In North America, super ferritic stainless steel 29-4C (S44735) is preferred for this application. In Europe, Type 316 or 316L (S31600, S31603, 1.4401, 1.4404, SUS 316) or 316 Ti (S31635, 1.4571) is used for the inner liner while Type 304 may be used for the outer liner of a double walled system.

Follow the link to the brochure below for more information.

Flue Systems of Stainless Steel