Twinflex has been tested and passed by BSRIA to EN 1856-2 with the designation of T600. N. D3. Vml40010 G(25)

Twinflex Professional 904 Liner

316 is a high quality steel: 904 is virtually an exotic, so exotic that it is not readily available commercially. We use it because it is the highest possible quality for this type of use. It is, of course, much more expensive, about twice the price of 316 but when you consider the overall cost of the installation, it is worth every penny.

Sizes Available

125mm, 150mm, 175mm, 200mm, 250mm


Maximum temperature (exceptionally) 1100 degrees Centigrade.
Maximum temperature (operationally) 600 degrees Centigrade
Declaration of Conformity Installation Instructions

Fuel Type

Dry Logs, Peat, Oil, Gas, Open Coal Fires & Smokeless fuels


  • Optimum flexibility for installation.
  • Completely over-lapping inner skin for long life
  • Exceptionally smooth bore
  • Highest possible grade steel
Turner & Wilson were the first in the world to perfect continuously welded flue linings - a lead still maintained to this day.