Triple wall chimney system TW25

Triple wall chimney system is designed to supply combustion air to a room sealed heating appliance and convey the products of combustion to the atmosphere. System can be used internally or externally.

Chimney system for particular cases must be selected according to the documentation of the heating appliance manufacturer, chimney installation guide and national legal acts.


Oil, gas, solid fuels

Working temperature

≤ 450 °C


Inner pipe: stainless steel EN 1.4404

Middle pipe: stainless steel EN 1.4301

Outer pipe: stainless steel EN 1.4301 or painted stainless steel

Wall thickness

When dn from 80 to 200 mm – 0,5 mm
When dnfrom 250 – 0,6 mm

Pressure class

N1 – natural draught


Injected mineral wool, thickness – 25 mm

Sootfire resistance

G – resistant

Distance to combustible materials

≥ 80 mm

Tested non-enclosed and with insulated floor penetration

Condensate resistance

W – designed for wet operating condition



System marking

EN 1856-1 T450-N1-W-V2-L50XXX-G80





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