Flues & chimney liners
A stove, connecting pipe and chimney have to work as one installation. We assess the existing route or design a compatible factory-made system, then set out the components, clearances and termination needed for the chosen appliance and property.
When there is no usable masonry route
Where there is no usable masonry chimney, an insulated metal chimney may provide a route to outside air. Its position affects the room layout, floor and roof penetrations, external appearance, support points, terminal height and access for future inspection and sweeping.
The appliance instructions, chimney manufacturer’s installation rules and current Building Regulations are checked together. We do not mix apparently similar parts or decide the route from a photograph alone; the property and proposed appliance must be assessed first.
System components
A chimney system contains more than lengths of pipe. Supports, fire-stops, inspection access, weathering and the terminal all have defined roles, and each component must belong to the compatible tested system selected for the project.
These examples help explain a quotation; they are not a parts list for every home. The final schedule is set by the route, building fabric, appliance and manufacturer’s instructions.
A tested system may use proprietary fire-stop, support and finishing components where the chimney passes through a floor or ceiling. The exact part and clearance come from the selected chimney manufacturer’s instructions and the building construction.
The terminal is selected for the appliance, flue system, roof position and local exposure. Anti-downdraught and bird-guard products solve different problems, so a cowl should not be chosen as a universal cure for poor draught.
Some exposed or difficult chimney positions may need a specialist terminal, but only after the flue route, termination height and cause of the draught problem have been assessed. Product compatibility is checked before it is specified.
A twin-wall chimney is supported with compatible brackets and structural fixings at the intervals required by its manufacturer. The wall, stand-off distance, height and wind loading all influence the support arrangement.
Where an approved system passes through an external wall, its tested wall sleeve and associated components help form the opening and preserve the required separation from combustible construction.
Existing masonry chimneys
An existing chimney is assessed against the proposed appliance rather than automatically accepted or automatically lined. Its route, dimensions, condition, terminal and previous use all matter, as do the appliance manufacturer’s flue requirements.
If a flexible liner is specified, it must have the correct performance designation and diameter, use compatible connecting and terminal components, and be installed in the direction and manner required by its manufacturer. The quotation should identify the actual system rather than use “liner” as a catch-all allowance.
316 is used in many flexible chimney products, but the number alone does not confirm suitability. Check the product designation, permitted fuels, appliance instructions, installation method and warranty conditions for the proposed use.
904 products may be considered where their material and declared performance suit the fuel and operating conditions. It should not be sold as an automatic upgrade: compatibility, maintenance and the manufacturer’s warranty remain part of the decision.
Vitreous enamelled connecting pipe commonly forms the visible connection between an appliance and the chimney system. It is a different product from insulated chimney, with its own permitted use, joint direction, support and clearance requirements.
At an existing fireplace opening, the connecting arrangement may include an adaptor and a closure or register plate. The detail depends on the chimney and liner design; the plate is not a substitute for compatible connections or access for inspection and sweeping.
Changes of direction should use matching factory-made components and stay within the limits in the appliance and chimney instructions. The visible alignment is agreed only after the stove position and complete route have been checked.
Existing chimney
An existing chimney may need to be swept and inspected before its condition and suitability can be confirmed. The quotation should state who arranges that work and whether further investigation is needed; it should not be hidden inside a generic installation promise.
Sweeping removes deposits but does not by itself prove that a chimney is sound or correctly sized. The findings still have to be considered alongside the selected appliance and proposed connection.
Survey coverage
Survey requests are considered across Lichfield, Birmingham, Sutton Coldfield, Tamworth, Cannock, Walsall, Aldridge, Solihull, Wolverhampton, Burton upon Trent, Stafford and Derby. The route, terminal, access requirements and visible sections are assessed before the system and installation area are confirmed.
The verified local page is Lichfield. Use thecoverage overview for the wider published list; individual town pages remain unlinked until they contain verified local evidence.
Combustion safety
Approved Document Jrequires a suitable carbon monoxide alarm when a fixed combustion appliance is installed in a dwelling. Use its illustrated guidance together with the alarm manufacturer's instructions for the final position.
Specification questions
Our company policy at The Fireplace & Stove Co.
We only install woodburning and multifuel stoves with a suitable stainless-steel flue liner. For woodburning stoves, we generally use 316-grade stainless steel, while for multifuel appliances we recommend 904-grade stainless steel due to its greater resistance to the more corrosive conditions associated with burning solid fuels.
Modern stoves are highly efficient, which means the flue gases can be cooler than with older appliances. Installing a correctly sized flue liner helps maintain the temperature and flow of the flue gases throughout the masonry chimney.
A correctly installed liner also helps improve the performance of the appliance and reduces the risk of condensation, tar and creosote deposits building up within the chimney, which can contribute to chimney fires.
Yes. At The Fireplace & Stove Co., we always replace the existing flexible liner when fitting a new stove. We remove the old liner, sweep the chimney and install a suitable new liner for the chosen appliance. Our installations follow HETAS safety guidance and the appliance and liner manufacturers’ instructions. This means your new stove starts with a new, correctly specified liner, rather than relying on the condition or history of an older one. A damaged or leaking flue can allow combustion gases, including carbon monoxide, to enter the home, creating a risk of potentially fatal poisoning. A carbon monoxide alarm is essential protection, but it does not make an unsafe flue safe.
The steel grade is only part of the specification. The selected liner must carry the correct designation for the appliance and fuel, be installed to its manufacturer’s instructions and be used within its warranty conditions. The survey and appliance instructions determine the appropriate product.
Often, yes. A compatible factory-made insulated chimney may be routed internally or externally, subject to the appliance, property, termination position, clearances and planning or building constraints. The route has to be designed before it can be quoted.
It describes a factory-made chimney system with inner and outer walls separated by insulation. It must be treated as a complete tested system: components from different manufacturers are not assumed to be interchangeable.
Can your company sign off and register with Hetas an installation completed by another company
Further guidance: Schiedel’s guidance on reusing flexible linersand HETAS carbon monoxide safety advice.
Continue the specification
Compare the appliance records that determine the chimney's declared requirements.
View stove recordsUnderstand the separate roles of appliance servicing and chimney sweeping.
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