Flue for woodburner
Flues for wood-burning and multi-fuel stoves, including flexible flue liner, single skin flues and insulated flues or twin wall flues.
Chimneys and flues are also available in a number of different materials – stainless steel, concrete, pumice, clay or ceramic and plastic. Concrete, pumice and clay or ceramic are collectively referred to as masonry chimneys. Plastic flues are only allowed to be used with low temperature condensing applications. Care must be taken to check the designation of stainless steel chimney systems and flexible liners as a limited number are specifically designed for use with gas fired appliances. These must not be used with wood burning or multi fuel appliances. Clay and pumice chimney systems and liners are suitable for wood, multi fuel, oil and gas. Concrete gas flue blocks, as the name suggests, are only to be used with gas effect fires and must not be used with wood or solid fuel fires.
The terms flue and chimney are often used interchangeably. The flue is the working part of the chimney, conveying the products of combustion safely to the atmosphere. The chimney includes the shaft within which the flue is housed. A flue works under negative pressure drawing the product of combustion from the appliance.
Flexible liners as woodburner flues
Stainless Steel Flexible Liners
Stainless steel flexible liners are certified to BS EN1856-2.
Flexible liners are used to reline an existing chimney. Care must be taken when selecting a flexible liner. There are two types of flexible liners:
- Single skin liners for use with gas appliances and
- Twin skin liners, manufactured from overlapping strips of high grade stainless steel to give a smooth sealed flue-way. These liners should be used with wood and multi-fuel appliances. Single skin liners must never be used with wood or multi-fuel applications.
Wood burning stove flue
Stainless steel system chimneys consist of two concentric stainless steel metal walls with insulation filling the annular space between them. Some systems have a ceramic liner, which can offer a longer life.
Factory made steel systems are easy to handle and available with a wide range of fittings such as elbows, terminals and tees, all of which simple lock or push together. They are easily assembled and supported with purpose designed support brackets. These products, which can be used internally and externally, must be certified to BS EN 1856-1:2009. Stainless steel flue systems tend to be used in existing buildings that do not have a chimney and extensions, because they do not require a dedicated foundation and can be easily retrofitted.
Connecting Flue Pipes
Connecting Flue Pipes are designed to connect the appliance to the flue. The pipe is usually decorative because it is visible in the living area.The stove chimney pipe options are vitreous enamel or single wall stainless steel.
Single wall stainless steel is certified to EN1856-2.The vitreous enamel coating should comply with the recommended requirements for high resistance to heat in BS1344 part1:1994 part 7:1984 and acid resistance BSEN 14483-1:2004. The European Standard for vitreous enamel low carbon steel flue pipes is BS60009-1989.
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