Why Choose the Stainless Steel for Flue Pipes?

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flue pipes

Stainless steel for flue. The winter is coming and your customers are tied up with mounting of flue pipes. Why not encourage them to use those in stainless steel?

Why choose the stainless steel for flue pipes?

In recent years there has been a growing diffusion of stainless steel flue pipes. But the use of this material is becoming more and more frequent in plant design for the evacuation of fumes. Why? For its excellent specific characteristics. In fact, the AISI 316L austenitic stainless steel:

  • is resistant to the corrosive effects of acid condensation
  • offers inadequate resistance to flow of the fumes
  • reaches (and exceeds) in a short time the “dew point” that is the value of temperature which gives rise to the phenomenon of condensation

Thanks to their linear form, the flues can:

  • easily be insulated
  • maintain an adequate temperature of the inner insides.

The effects of corrosion and residual heat.

What are the effects due to the heat and corrosion?

  1. HEAT EFFECTS: the temperature value is extremely variable in relation to the type of heat generator used. In fact, the interval:
  • for wall-mounted condensing boilers is about 50 °C
  • for the fireplaces and wood stoves is about 300 °C

The use of stainless steel prevents deterioration due to the effects of heat and all of thermo-mechanical stresses.

  1. CORROSION EFFECTS: the nitric and sulfuric acid presence (together with the presence of chlorine or other corrosive substances in the air combustion) aggravates the aggressive action, causing serious damages of the insides that comes in contact with the fumes. An example? The acids (with high concentrations of chlorine) used in environments such as industrial laundries, dry cleaners and hairdressers if dissolved in air are highly corrosive. Therefore, the use of AISI 316 stainless steel makes the flue suitable for use with various types of fuel and various weather conditions.


The gas and condensation resistance of stainless steel.

The gas and condensation impermeability is one of the basic requirements, especially for security. In fact, the fumes have a high toxicity due mainly by the presence of sulfur and carbon oxides. The increasing diffusion of installations with exhaust of forced draft fumes makes more frequent cases of chimneys running in positive pressure. Finally, the use of external junction cable ties ensures the stability of the connections by the mechanical character of stresses.


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4 thoughts on “Why Choose the Stainless Steel for Flue Pipes?”

  1. we are building a new outdoor chimney because our new furnace which is an oil and wood combination furnace has an 8 inch flu and the old indoor chimney is only a 6 inch flu. We need to know the correct way to do this. We will be building it with cement blocks and want to just put a stainless steel liner inside can we do that. Are there any regulations in the State of Maine that we need to know about

    1. Hi Anna,
      for the construction of the flue inside the concrete blocks, AISI 316L stainless steel is the most suitable.
      You can choose between two systems depending on how you have planned to build the outdoor flue: Flexible double-walled flue stainless steel, easier to install, but with the limit of having to pay more attention during maintenance.
      Or with rigid pipes (which are the best system in terms of metals and the most used by flue manufacturers). As for the laws of the state of Maine on the subject, I refer you to the institutional site where you can find all the necessary information:

      Have a nice day!

      Alessandro – Inox Mare Staff

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