Double-walled chimney systems of the KOMIN-MAX DUO ŻARO type with an internal jacket made of heat-resistant sheet are designed for removing flue gases from wood-fired devices and ecological solid fuels as free-standing chimneys.

Insulated heat-resistant chimneys are used for the construction of free-standing chimneys to remove flue gases from wood-fired heating devices. The chimney made in this technology is a stand-alone structure, not requiring the use of conventional ceramic material.

The inner chimney jacket in double-walled is made of acid-resistant chromium-nickel sheets of grade 1.4828 according to DIN 17441 with a thickness of 1.0 [mm], the outer jacket is made of acid-resistant steel 1.4301, thickness 0.5 - 0.6 [mm], the thermal insulation is 70 [mm].