Metaloterm AT

Metaloterm AT

The Metaloterm® AT system is a modular twin wall insulated chimney system, made of stainless steel, with a high quality insulation* and no thermal bridges. Metaloterm® AT is suitable for high temperature, non-condensing applications with flue gasses in negative pressure. The system is not only chimney fire resistant but also reusable afterwards. Therefore the system is ideally suited for applications such as wood-fired stoves and open fireplaces. However in case of a chimney fire the system has to be inspected internally by a qualified party to check the integrity of the system before use.  For Passive houses the Metaloterm® assortment provides the Iso-block which can be combined with AT. Due to the proven quality Metaloterm® AT has a 30 year guarantee.

*Up to 350mm diameter is supplied with Amgiso insulation. From diameter 350mm onwards we provide Rockwool insulation.


  • Wood-fired stoves
  • Open fire-places


  • Inner and outer wall from high quality stainless steel
  • High quality insulation 37.5 mm thickness
  • No thermal bridges; uninterrupted insulation from base plate to top stub
  • Stress free thermal expansion
  • Compatible with Metaloterm® EN
  • Chimney fire resistant and reusable
  • Large programme of fittings
  • Wall brackets up to a distance of 400 mm available
  • Immediately ready to use
  • 30 years guarantee, even after chimney fire!



Name Finish Type Code View
Black Matte heat resistant stove paint Ontop code 910
Antraciet Matte heat resistant stove paint Ontop code 930
Grey Matte heat resistant stove paint Ontop code 970
Black grey Half shine powder coated Ral 7021
Olive black Half shine powder coated Cewetherm 300

Other colors on request:

  • RAL-code
  • Powder coating | wet paint
  • Shine| half shine | matt


Technical characteristics, Offset calculator, Downloads, Construction examples, Assortment

years Schiedel


Ontop B.V. at ISH 2019

Ontop B.V. showcases flue gas systems at ISH 2019 in Messe, Frankfurt.

Read more

Rais chooses the quality and design of Metaloterm!

Rais stoves and inserts stand for Danish design of the highest quality. And recently they have added chimney tubes to their collection. Ontop developed a special product line for Rais in the colours black, white, nickel, silver, mocha and platinum.

Read more

Will you visit ISH 2019?

We are delighted to invite you to visit us on Messe Frankfurt in the Hall 11.1, E51 of the ISH Fair.

Read more

More news