conduit concentrique étanche triple paroi
conduit pour appareil à bois haut rendement
Système d'évacuation des fumées
conduit concentrique étanche triple paroi
conduit pour appareil à bois haut rendement
Système d'évacuation des fumées


20mm insulated triple wall system chimney for wood burning stoves

The Efficience chimney system is a concentric insulated chimney with mineral wool insulation allowing the connection of combustion air and the smoke exhaust. This system has been designed to operate safely with the latest generation of high efficiency wood burning stoves and is suitable for use in all types of air tight housing, new build or renovation projects.

This chimney system works in negative pressure and optimises the appliance’s efficiency and can be used on top or rear connection appliances. 

It is available in 5 diameters (Ø100, Ø130, Ø150, Ø180 & Ø200).






Product details

> Optimise the performance of the appliance.  

> Avoid down-draught issues.

> Pre-fabricated chimney stack available.

> Available in any RAL colours.

> Table of recommended Efficience connections by stove make and model(PDF)

All of the products offered by Cheminées Poujoulat have been rigorously tested in every configuration by the CERIC Laboratory to ensure they meet highest standards (Building Regulation Document J - Amendments to Approved Documents).


Technical data



> Max. Temperature limitation: 450°C
> CE marking: 0071-CPR-24988
> Designation: T450 N1 D V2 L50040 G50 - Inner wall thickness: 0.4mm
> Insulation: 20mm high density mineral wool insulation.
>Air gap: 30mm

Air tight components

Combustion air components

Installation & regulation


The installation must be completed in accordance with the stove manufacturer and the chimney manufacturers installation instructions and in compliance with current regulations/standards.


> Lateral (wall bracket) every 4 metres.
> Deadweight (wall support) every 16 metres.
> Freestanding up to 3 metres above last support with Reinforced Locking Bands (2 metres as standard)

Chimney passing through the ceiling floor level

> Joints between chimney sections and associated locking bands shall not occur within any ceiling joist space or wall/partitions.

> Fire-stops or Fire-stop/spacers shall be fitted to the frame formed between compartments through which the chimney passes.

> The lower end of the chimney shall extend at least 150 mm below a non-combustible ceiling, but the required clearance distance from combustibles to the connecting flue pipe must also be respected, usually three times the diameter of the connecting flue pipe eg. 150 dia. pipe = 450mm clearance to combustible.

> Where the flue pipe connects to the chimney the connection shall be made using our Pipe Connection Length (EDP) or using our P Adaptor which can be supplied with any spigot diameter so suit.

Distance to combustible materials

> Therminox has exceptional thermal properties that guarantee a true 50mm clearance to combustible materials.


> The chimney system shall have no more than 4 bends in total. 2 bends in the chimney and 2 bends in the flue pipe connection.

> The offset shall provide a change of direction no more than 45° from the vertical.

> The run of chimney between bends shall not exceed 20% of the total chimney length.


> It is important that chimneys serving all types of solid fuel appliance are swept regularly to remove soot, tar and potential blockages.



Download PDF


Download PDF


Download PDF


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