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Devon Kitchen Stoves

Wood burning & Multi Fuel Stoves
Range Cookers Specialists

01837 83333
Devon Flues and Pipes
Okehampton, Devon.
Tel: 01837 52244
Devon fireplaces Torbay
Devon Fireplace Specialists
Tel: 01803 883700


Devon Flues Pipes
Fires, Fireplaces and
Decorative Plaster
Ottery St Mary, Devon
TEL: 01404 812876


Devon Flues and Pipes Specialists give a brief overview on Flues.

Flues- What is a Flue?
For any stove or fire to work successfully it must be connected to a sound chimney and a correctly sized flue. A chimney works because hot air rises. Factors such as running the appliance at a very slow rate or cold air leaking into the flue, will cools the gases down and affect the performance of the chimney. An efficient wood burning stove or boiler produces flue gases that are cooler than an open fire. For this reason it is necessary to install an insulated liner within an existing chimney when a wood burning stove is installed to ensure that there is a sufficient draw of air. If there is no existing chimney it is possible to install a wood burning stove or boiler by constructing a twin walled flue using one of the proprietary systems.

Flue advice from Specialists in Devon
Flue outlets must be above the roof line to effect clear, unhindered dispersal of combustion products without creating a fire hazard. The direction of the flue should be should be straight and vertical where possible. Horizontal runs should be avoided and in any event must not exceed 150 cm in length. Bends should not exceed 45º to the vertical to maintain natural draft and ease of cleaning. There should be no more than two bends in a flue. Only one appliance may enter any flue and all flues should be insulated to prevent condensation of water/tar and to protect the building against the effects of chimney fires.

Flue Liners
Houses built since 1965 have chimneys built with liners during their construction. This was usually done with a clay liner which should last the life time of the building, although may do not due to poor installation standards. Prior to 1965 lining was less common and chimneys were instead rendered with a lime mortar.

Most old chimneys need to be relined before they can be re-used, particularly those that were built without a lining or have a flue that is too big and inefficient for modern stoves and fires. After years of use an old chimney can suffer attack from heat and soot deposits that erode mortar joints. This can cause many problems, such as staining and also leakage of dangerous fumes into the home. Installing a new liner that provides a new sealed and correctly sized flue can dramatically improve the efficiency and safety of an old chimney

There are several methods of doing this suitable for a solid fuel appliances which include:

  • Installing rigid sections of clay, refractory concrete, ceramic or pumice into the chimney by cutting into the flue wall or by lowering down from the top.
  • Pumped refractory concrete around an inflatable former by a specialist contractor.
  • Rigid metal liners made from high grade stainless steel pipes lowered from the top.
  • Flexible metal liner in continuous length either lowered down or pulled up the flue.
  • Spray on coating by a specialist contractor.

Generally, for solid fuel and wood burning the space around the new lining should be filled with an insulating material such as Perlite, Vermiculite or Leca. Better still, the lining material itself should have a high insulation value i.e. liners made with pumice.


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