TWINFLEX MF
THE ULTIMATE FLEXIBLE FLUE LINER

TWINFLEX MF

Some people think that flexible chimney liners are all much the same.
Experienced installers know this is not the case, in fact Our Twinflex MF has several unique features which set it apart from 'ordinary' chimney liners.

Triple Lock Construction

Twinflex is constructed from 2 single strip stainless steel and locked in 3 planes. This gives maximum joint integrity and allows even weight and load distribution throughout the entire length of the installation.

Superior Quality

Twinflex is built with high performance 316 or 904 Stainless steel. The smooth inner bore allows optimum passage of flue gases and draining of condensates.

High Overlap

The Twinflex is simply superior. The unique large overlap of the joint formed by the inner skin protects against acid penetration. On close inspection you’ll find some liners on the market with minimal or non existent overlaps.

25Year Guarantee

316 Grade


35Year Guarantee

904 Grade



Gallery

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Wing Nut Adaptor

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Register Plate Adaptor

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Long Tail Adaptor

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Increasing Adaptor

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Screw Type Suspending Cowl

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Star Clamp Suspending Cowl

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Suspending Cowl

FAQ

How do i register my liner warranty?

All Twinflex MF liners come with a 25 year 316 liner warranty & 35 year warranty for 904 grade liner. Your invoice confirms you purchased the liner from Turner & Wilson.

Please complete the liner registration form on our website to apply and actvate your warranty. click here.

What temperatures will Stainless Steel Liners withstand?
The melting point of Austenitic Stainless Steels is in the region of 1300 to 1400 degrees Centigrade, varying slightly according to the precise grade. However they start to become iincreasingly plastic after the threshold point of 1000 - 1100 degrees is reached. 316 grade being is at the higher end of these spectrums. At higher temperatures surface oxidisation will cause discolouration. This usually takes place above 600 degrees. Although this decreases the life of the steel, it is usually insignificant.
Is insulation or back-filling necessary?
There are two schools of thought on this matter, both with valid merits. Back-filling with vermiculite increases the insulation, keeping the flue warm, reducing condensation with the result of improved drawing powers on the flue and perhaps extending the life of the lining. There are two draw backs to insulating. One is that the insulation must remains dry. Should it become wet then it will be worse than useless. The other is that should the lining have to be removed, then the insulation becomes a considerable problem - particularly vermiculite. Leaving the void un-insulated, however avoids these problems. True the insulation is not as good but when the installation is viewed as whole, then there is the liner, an air gap , then the masonry. Together these form a pretty good level of protection which, except in the most extreme of circumstances, is quite adequate. Removing or changing the liner is a very easy matter. On balance Turner and Wilson prefer not to insulate, but if the installer thinks it is best then that is fine with us.
Which liner should i use?
Product
Fuels
Weldline Gas (condensing and non condensing), Oil (28 seconds), Prophane, Butane
 Triplelock Non condensing Gas, Prophane, Butane and  Oil (28 seconds)
Twinflex Professional 316 ****A 316L grade liner ideal for gas, oil and wood burning appliances and can be used on intermittent use solid mineral fuel or multi-fuel appliances.
Twinflex Professional 904 ***A 904L grade liner which can be used on all of the above situations plus where there is to be regular or continuous use of solid mineral fuels.

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Technical Details

****A 316L grade liner ideal for gas, oil and wood burning appliances and can be used on intermittent use solid mineral fuel or multi-fuel appliances.

***A 904L grade liner which can be used on all of the above situations plus where there is to be regular or continuous use of solid mineral fuels.

Fuel type Dry Logs, Peat, Oil, Gas, Open Coal Fires & Smokeless fuels
Diameter Range 100mm, 125mm, 150mm, 175mm, 200mm, 225mm, 250mm
Inner Liner Material 0.1mm grade 316L stainless steel / 0.1mm grade 904L stainless steel
Outer Casing Material 0.1mm grade 316L stainless steel
0.1mm grade 904L stainless steel
Joint Method Triple lock joint system
Designations BS EN 1856-2: T600 N1 D Vml50010 G
BS EN 1856-2: T600 N1 D Vml70010 G
CE Approved Yes
Maximum Operating Temperature 600°C - 1100°C negative pressure
Warranty 25 years 316 grade
35 Years 904 grade