Flexible Chimney & Flue Liners Installation

flexi Our exclusive Multiflex “Class 1″ flexible stainless steel multifuel flue liners are designed to provide a quick and economical solution for improving the safety and efficiency of old chimneys for use with wood, coal, gas or oil burning appliances.

In many situations Multiflex is the best choice for solving common chimney problems.

multiflex 316 1Multiflex leads the market in terms of quality, proven performance and technical back up. According to chimney specialists and installers across Britain it is the strongest and most flexible flue liner on the market.

The liners are CE marked with a performance designation which exceeds Building Regulation Requirements and is far better than many other liners. (See specifications below for the full performance designations).

Multiflex protects old chimneys against deterioration and leakage by providing a smooth gastight flue that withstands high temperatures, minimises the risk of tar deposits and warms up quickly to create a strong up draught, allowing stoves and fires to operate efficiently.

Multiflex is the unique name for our exclusive range of liners that are recognised for their high quality, leading specification and performance that many try to copy. Beware of any imitations that attempt to use the Multiflex name, which is a Registered Trademark.

Our liners are available in the following diameters and can be supplied in cut lengths or full coils in boxes or on cradles.


Diameter – mm (inches)

125 (5″)

155 (6″)

180 (7″)

200 (8″)

230 (9″)

250 (10″)

300 (12″)

Coil length in box








Coil length on cradle





to order

The liners are specially designed for quick installation with the minimum of disruption, and their flexibility can cope with bends of up to 45 degree and typical “offset” Victorian chimneys.

A comprehensive range of fittings and adaptors are available to ensure quick installation and easy connection to stoves, boilers, inset and open fires.

multiflex 316Multiflex approvals and specifications

Multiflex liners have a robust double-skin construction for use with multifuel burning stoves, fires or boilers. The inner wall is designed to provide a smooth gas tight flue for the safe and efficient passage of flue gases. The outer skin has a durable corrugated construction to allow maximum flexibility and strength.

The liners are CE marked and included in the HETAS list of approved products for use with wood and solid fuel appliances.

Multiflex is available in the following grades of stainless steel, which are all CE marked confirming that they have passed the performance testing to BS EN 1856-2.

·         Multiflex 316 is made from standard 316 grade stainless steel for use with open fires, multifuel or wood burning stoves, and appliances burning gas or oil. The performance designation is T600 P2 W VmL50010 G.

·         Multiflex 904L is made entirely from high-grade 904L stainless steel that has significantly increased resistance against corrosion. Designed for use with coal or solid fuel burning appliances and for installations where a higher specification of liner is required. The performance designation is T600 P2 W VmL50010 G.

The performance designation for Multiflex liners exceeds UK Building Regulation requirements and is far better than most other liners.

T600 and P2 means the liners are tested to the nominal operating temperature of 600ºC and have passed the P2 gas tightness test at the exceptionally high pressure of 200 Pascal, which is also applied after the 1000ºC soot fire test. Most liners

Many feel these performance results prove that the design and quality of the Multiflex is far superior to ordinary liners that have the lower designation of a T400 operating temperature and N2 gas tightness test carried out at only 20 Pascal pressure.

Installation services

We also offer a supply and installation service in South Wales using our HETAS registered installers based in The Vale Of Glamorgan, Cardiff, Dyfed, Swansea, Monmouyh, Powys and Gwent.

Relining Chimney and Building Regulations

It is a legal requirement that all relining installations comply with the Building Regulations, which for England and Wales is explained in the Approved Document J. These are minimum requirements aimed at making sure installations are safe.

Most people recommend using a HETAS registered installer to fit a stove and liner. However, you need to be sure that they are covered for this type of work.