Conventional Flue

A conventional flue (sometimes called an openflue appliance) uses a flue continuously rising from the top of the cooker and terminating above the highest part of the roof.

Conventionalflue _150x 150Older properties may have a convenient chimney built of stone or brick which can be used for this purpose, providing that the inside is lined with an acid resistant material, again commonly referred to as the 'flue'.

Sometimes, when there is no masonry chimney, the flue-pipe from the cooker can be taken all the way up using special prefabricated flue systems consisting of twin-wall pipe and usually manufactured from stainless steel.

The type of material used depends on the fuel type and cooker model, as does the size of flue (diameter) This can range from 125mm (5") for some gas-fired models to 200mm (8") for a multifuel or woodburning cooker. Generally, models providing central heating as well as cooking require larger flues.

A single wall pipe connects between the cooker and the main chimney, preferably made of cast iron, as this matches the appearance of the cooker and helps to reduce noise levels. The flueway inside the main chimney should normally be one size larger in diameter than the connecting pipe.

Usually the flue must rise continually with no horizonal stretches and clear rules on the angle of  any pipe that isn't truly vertical. Some solid fuel cookers (not oil or gas) can connect into a masonry chimney from the rear, with a maximum 150mm horizontal pipe.

Appliances must not share a flue, although there can of course be several separate flues travelling together inside a traditional chimney.

Conventional flued cookers can be sited on internal or external walls within the property as convenient.