Double-wall 25 mm Extra
Purpose: To remove the products of combustion from the combustion space to the atmosphere
Fuel: Oil, gas, solid
System marking according to EN 1856-1
Ø 80-300 mm, T450-N1-W-Vm-L50(050-100)-G70
Ø 350-450 mm, T450-N1-W-Vm-L50(060-100)-G105
Ø 500-600 mm, T450-N1-W-Vm-L50(060-100)-G140
T450°C – maximum operating temperature
N1 – natural draught
W – wet operating conditions
Vm – resistant to corrosion
G – resistance to soot fire
70;105;140 – distance to combustible materials
Flue liner - L50 – stainless steel 1.4404
Ø - 80-200 mm – 0.5; 0.6; 0.8; 1.0 mm
Ø - 250-550 mm – 0.6; 0.8; 1.0 mm
Ø - 600 mm – 0.8; 1.0 mm
The outer pipe – stainless steel 1.4301
The outer pipe – painted stainless steel 1.4509
Insulation – injected mineral wool, thickness -25 mm, density 180 kg/m3
Why choose double-wall 25 mm extra chimneys?
- Multi-fuel use.
Suitable for oil, gas, and solid fuel. - Wide size range.
Available from Ø80 to Ø600 mm. - Space-saving insulation.
25 mm mineral wool (180 kg/m³) — slimmer than the 50 mm version, still very effective. - Scales with size.
Clearance to combustibles from 70 mm to 140 mm depending on diameter. - Solid construction.
Outer pipe in 1.4301 or 1.4509 stainless steel, plain or painted. - Certified safety.
Meets EN 1856-1 for wet conditions, corrosion resistance, and soot-fire resistance.
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