Flexible Flue Liners
 |
We pride ourselves in giving a first class service using good quality materials at a competetive price. It is so important to install good quality flexible flue. The ability for the flue pipe to bend and withstand the forces that are generated during the installation and annual cleaning process is clear. A chimney sweeps brush will exert pressure on the sides of the pipe to ensure that it cleans the flue, bends in the pipe increase these loads a great deal more. All flexible flue is made as in one big spiral, the joints of the spiral are the week points, a cheap flue may have weaker. We can supply local installers from our stock in the showroom. |
Gwent fire installations carry out the following work as standard on a all flexible flue fittings.
Installing a fully clamped and supported liner mounted on a steel plate underneath the chimney pot.
Maintaining the Existing chimney pot where possible to ensure the look of the house is unaltered, usually with the addition of a Terracotta rain cap if required.
A register plate is installed to isolate the chimney cavity from the room, this ensures that even heavy masonry falling from the flue will not enter the room. This makes for an extremely safe installation.
The rigid fixing of every flue joint ensures that a seal is maintained and eliminates the risk of separation when cleaning or heat expansion.
Installed Flue Pipe
 | Generally Insulated flue is used where a normal chimney does not exist, we use a good quality German flue called ICS. Insulated flue pipe is otherwise known as twin wall insulated flue pipe. This product could be supplied by a number of manufacturers. We can supply this from our showroom or to order. |
Part J Building Regulations
The 2002 edition of Approved Document J of The Building Regulations stipulates that any work that affects an existing chimney now comes under building control. This means any modifications or additions i.e. Fitting a stove (even replacing an old one), lining a chimney or modifying the existing design of a flue |
 |
An existing chimney or a new flue or chimney installation must be given a visual inspection to check that it is in good order (this should take the form of a risk analysis based on the safety of the installation).
 | It must be clear of obstructions and be of a suitable size and type for the appliance you plan to install. It may be necessary to sweep the flue (which should always be done prior to fitting a stove or lining a chimney) and also, if necessary, do a smoke test to check for gas tightness |
A permanent notice plate should be fixed at an appropriate position giving details of the location of the fireplace, the type and size of the flue and type of heating appliance used.
Other Building Regulations that commonly affect stove and flue installation
Flue pipe clearance when adjacent to combustible materials
Any single wall flue pipe used, both rigid and flexible, must not be closer than three times the diameter when adjacent to combustible materials (i.e. wooden fireplace lintel).
Flue height above the roof
To calculate the minimum height of a flue above the roof line, it is best to refer to the images given in the relevant approved document or ask Gwent Fire Installations about your specific requirements. However it can be said that as a minimum length you must have a flue at least 4.5m high for a closed appliance/stove and 5.5m for an open fire. Plus any additional criteria to clear the roof.
Ventilation
Fixed ventilation must be provided when installing any solid fuel stove which has an output higher than 5kws. Therefore 550 sq mm/Kw over 5Kw of ventilation is required. This means fitting an airbrick of sufficient size.
Gwent Fire Installations: enquiries@fireinstallations.co.uk