Twin-wall flue systems

Twin-wall flue systems, as the name suggests, are double-lined ducting systems that usually contain a layer of insulation between the Walls to ensure the reduction of heat transfer.
Relatively low external skin temperatures can be obtained with twin-wall systems through the selection of the correct material grade and annulus thickness, depending on the flue gas temperature. A minimum 50mm clearance must be maintained from the outer skin to all combustible materials.
At A1 Flue Systems, we offer two specific types of twin-wall products:
Twin-wall flue systems are designed for use where:
Application examples include:
The complete range of A1 Flue Systems’ twin-wall chimney products has been successfully tested in accordance with B5476 Part 20 for stability and integrity during a four-hour fire test. They have also been CE Marked in accordance with British Standard (BS) 1856.
For technical help on twin-wall flue systems, download our product brochure. You can also either email our Technical Department at [email protected] or call 01623 867303.
Also see Deltavent, A1’s own unique twin-wall flue system.