A1 Flues
A1 Flues

Deltavent twin-wall flue systems

Deltavent is A1 Flue Systems’ unique twin-wall flue system that is used in installations where the reduction of heat transfer from the hot omission gases inside a flue to the external environment is required.

This double-lined ducting is available as Deltavent 25 (with a 25mm insulating gap) or Deltavent 50 (with 50mm mineral wool insulation). There are also 75mm and 100mm annuli available on request.

Deltavent twin-wall flue systems are designed for use where:

  • A four-hour fire rating is specified
  • A positive-pressure high-temperature exhaust/duct system is specified – such as a watertight flue system

Application examples include:

  • Diesel generator exhausts
  • Condensing boilers
  • CHP systems
  • Fan-assisted flue systems
  • Kitchen extraction systems
  • Smoke extraction systems
  • Incinerators/cremators
  • Heavy-duty flanges for joining

The complete range of A1 Flue Systems’ Deltavent 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 Deltavent twin-wall flue systems, download our product brochure. You can also either email our Technical Department at technical@a1flues.co.uk or call 01623 867303.