Re-line a suitable masonry chimney with this 125mm 316/316 stainless-steel flexible flue liner. Both skins use corrosion-resistant 316L-grade stainless steel. Therefore, this liner provides a practical and cost-effective option for many domestic stove and heating installations.
The double-skinned construction creates a strong and continuous flue route inside an existing chimney. In addition, the smooth inner surface helps flue gases travel upwards efficiently.
This liner suits compatible appliances burning cured dry wood, gas, oil, coke or cured dry peat. However, you must check the appliance instructions and installation requirements before choosing the liner grade, diameter and length.
Important: This flue liner is cut to your selected length. Therefore, please check the required diameter and length before ordering. Once cut, it cannot be returned unless it is faulty.
Suitable Fuels Cured dry logs Coke, where permitted by the appliance manufacturer Cured dry peat Gas Oil
Always use a fuel approved by the appliance manufacturer. In addition, avoid wet or unseasoned wood because it can create more soot, tar and corrosive condensate.
If you plan to burn approved smokeless coal mineral fuel regularly, consider a 904/904 stainless-steel liner. The higher-grade steel provides greater resistance to the more corrosive deposits produced by some fuels.
A 125mm liner may suit an appliance that has been tested and approved for a 125mm flue. However, many wood-burning appliances and installations require a 150mm liner.
Therefore, always check the appliance instructions, current Building Regulations and HETAS guidance before ordering. A competent installer should also confirm that the liner will pass through the existing chimney.
If the appliance does not permit a 125mm flue, you may need a 150mm flexible flue liner. Never reduce the liner below the diameter allowed by the appliance manufacturer or current regulations.
The smooth inner skin uses 0.12mm 316L-grade stainless steel. Meanwhile, the convoluted outer skin also uses 0.12mm 316L stainless steel.
The manufacturer forms the liner from a single strip of stainless steel. It bends the material through 180 degrees and folds the seam across four planes. As a result, this construction produces a strong yet flexible liner for suitable masonry chimneys.
The best grade depends on the appliance, fuel and expected use:
If you are unsure which grade to choose, ask your stove installer or contact SNH Tradecentre before ordering.
A suitably competent installer should fit the liner from the top of the chimney. The directional arrows printed on the liner must point upwards in the direction of the flue gases.
Always follow the manufacturer’s instructions and current Building Regulations. Where appropriate, use a HETAS-registered installer. Gas appliances must be installed by a suitably qualified Gas Safe registered engineer.
Please note: Adaptors, clamps, plates, cowls, nose cones and other installation components are not included unless the selected product option states otherwise.
This 316/316 flexible flue liner carries a manufacturer’s lifetime warranty, subject to the manufacturer’s terms and conditions.
The warranty may depend on correct product selection, installation by a competent person, use of approved compatible components, permitted fuel use, registration and regular maintenance.
Complete the MI Flues lifetime warranty registration form after installation.
Keep your SNH Tradecentre invoice and installation records. The manufacturer may require this information if you make a warranty claim.
The registration may require:
Arrange regular chimney sweeping and inspection after installation. Chimneys serving solid-fuel appliances should be swept as often as the appliance, fuel and frequency of use require.
However, the chimney should normally be swept at least once each year. Some installations may require more frequent cleaning. Always follow the appliance manufacturer’s instructions and the advice of a qualified chimney professional.
SNH Tradecentre is an independent plumbing and heating merchant based in Birchington, Kent. We supply flue products to homeowners, stove installers and trade customers across the UK.
In addition, we work closely with MI Flues to provide product support and process flue-liner orders quickly. This close relationship helps us dispatch many available orders on the same working day when they arrive before the relevant cut-off time.
If you need help selecting the correct liner or installation components, call SNH Tradecentre on 01843 842727.
Please check the following before placing your order:
Made-to-measure liner cannot be returned once cut unless it is faulty.