Chimney and Flue Systems

Chimney and Flue Systems

Definition: A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors.
 
Flue systems comprise the fittings and pipes that draw fumes away from your stove to the outside and provide fresh air allowing the fuel to burn efficiently.
 
At Y Cwtsh we recommend Midtherm Flue Systems to our customers because Midtherm offer a complete range of affordable and durable stainless steel flue systems (including twin wall and coloured vitreous enamel to match your interior) for gas fires, multi-fuel stoves and wood burning stoves. We are confident that their products not only perform to the highest standard but represent great value for money for our customers.
 
We know that most properties in South and West Wales have an existing chimney and whilst you can install a stove or fire and connect the flue into your existing chimney, you can also build a chimney from flue pipes without requiring a masonry chimney. This gives a certain amount of flexibility as to where your new stove or fire can be located - good news indeed if you're redesigning your home layout.
 
However, even if you have an existing chimney in your property, it is still a good idea to line the chimney, because a flue system improves efficiency by creating an efficient draw and by allowing an adequate air supply to the stove or fire. Using a lining which can improve the draw of the chimney, reducing condensation in the flue system, and reducing the risk of a chimney fire.
 
Due to the high efficiency of new stoves and fires, they will use secondary combustion so much of the energy from your fuel is used to heat the stove and surrounding air. This high level of efficiency causes the heat of the extracted gases to be generally cooler than that of a normal open fireplace. Cooler gases can result in a build-up of tar and this can increase the risk of a chimney fire as it sticks to the sides of the chimney.
 
Lining the chimney acts as insulation for the flue system reducing the condensation present thereby reducing tar deposits. This can be further improved upon by insulating the liner with Rockwool sleeves or chimney wrap through-out the liner. The liner is made from steel which tar does not easily stick to and this also reduces the possibility of chimney fires.
 
We always recommend, and it is good practise to install/use a liner when installing a wood burning appliance.
 
Reasons for use of appropriate flue liners:
 
If you are installing the flue through walls and ceiling (not via an existing chimney), then twin walling is a must. This is because the pipes on a wood-burning stove get extremely hot and the twin wall double-insulated pipes) will protect the ceiling, walls and roof from the heat which otherwise would be a potential and real fire hazard. Twin wall systems are used for both interior and exterior flue systems and are also suitable for multi-fuel appliances. These are more complex systems and subject to building control regulations, therefore we would always recommend that a professional HETAS registered installer is used to fit the stove and flue system.
 
It's essential that the right flue system is used, and we will be pleased to advise you. We will arrange a home survey to establish what is needed for your installation, and provide you with a detailed quotation for your new flue system.

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