Category Archives: flexible flue liner

twin wall flue pipe





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Installing a wood burner boiler stove or other heating appliance and planning to run your flue system through a wall or a floor, you will need to use a twin wall flue system.

Twin wall flues have a 1 inch of insulation around the inner layer pipe. The external diameter of twin wall pipe is two inches larger than the internal, which is the quoted diameter. This is due to the internal diameter being a crucial figure when drawing and designing a wood burner flue system, you should always keep in mind of this when installing, for instance if you were to be careless and purchase a 5 inch diameter twin wall pipe the external diameter will be 7 inches it could very well be too big for the install!

If you are passing through a wall you must always set it at the maximum angle of 45 degrees and also use a wall sleeve. You can finish the job off with finishing plates. If you are passing through an internal floor in your home you will need to use fire stop plates and remain at least 50mm away from combustible materials like joists.

Always have at least one length of single wall enamelled stove pipe as you cannot connect your twin wall pipe directly to your wood burner’s flue. It is then possible to use single wall pipe internally, we recommended that you do not go more than 1.5 meters before changing to twin wall but you certainly need to convert at least 4 inches before passing through a wall or floor. You should use an adaptor to single wall to allow you to convert to twin wall flue pipe and then once you have converted you must continue the flue system in twin wall.



Flexible Flue Liner





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What to look for when buying flue liners

There are many flue liners for wood burning stoves available and it can often be difficult to know what to look for. In most cases, you will need a flexible liner for a wood burning stove . These are easy to install by yourself or a professional, especially if your chimney has any kinks or bends.

Flue liners for wood burning stoves should be strong and capable of holding up under the force of being pulled down the chimney pipe. They should also be able to handle the high temperatures that they will be regularly exposed to, as well as the dampness that occurs inside chimneys.

Also want to make sure that the flue liner you are installing is the right size for your stove and/or chimney. At Chimfit, we will show you flue liners that are offered in a range of sizes; from 5″ flexible liner products up to 7″ flexible flue liner products are available and can be cut on the meter from one to a forty meter coil if required from our stockists and online shops.

Installing flue liners of wood burning stoves

As well as flexible flue liners, your chimney (if you have one) may need other items to ensure a safe and reliable install. Installing a flue liner into an existing chimney it is vital to be sure to get the chimney cleaned first as this will ensure there is no residual soot or other mess that could make difficulties whilst doing the installation. Once you have installed the flexible flue liner, it is important to that all work must be inspected as per the Building Regulations. This check ensures that all flue liners are properly installed; that they are the right size for the wood burning stove requirements.



Chimney Cowls





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The Chimfit range of chimney cowls and accessories provides everything that you need install and fit your flue system. If you’re looking to keep the birds and leaves out or if you’re trying to solve a downdraught problem, then we have a chimney cowl that suits. Chimney cowls are usually a hood or covering for the top of the chimney, fitted to the top of chimney pots primarily to increase the draught of a chimney and prevent backflow. Usage of the term “chimney cowls” has probably extended beyond its originally intended meaning.

Chimney cowls are traditionally coloured in a terracotta red, make from the same clay as the existing chimney pot it’s going to be installed on to. We also have some metal chimney cowls that are commercially available in a variety of styles and are mechanically retained for the chimney pot.

Our stock here at Chimfit includes:

– Pot hanging cowls to hang your chimney liner from, pot hanging cowls are an easy to fit solution to terminate your flue liner installation or can be used simply to keep the rain and birds away!

– Anti-downdraught hanging cowls to hang your chimney liner from and to help with problems with your up draught. Anti-down draught chimney cowls are wind driven terminals designed to create an up draught in flues; eliminating problems caused by down draughts. They also help birds not fall or fly into the chimney as well as provide additional ventilation to the room of the stove/boiler stove.

– Rain caps just to help protect your flue system from rain. Chimneys are exposed to snow, wind and rain and these conditions can take their toll on the system. To help maintain the chimney or flue, homeowners can invest in a wide variety of flue accessories, including a rain cap, which will keep water from going down the flue and damaging it internally.