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Flue Damper (255mm) & locking band.

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150mm / 6" diameter KC Twin Wall Insulated Chimney System flue damper.
Used to reduce up-draught within the chimney.

Availability: In stock


Delivery: normally within 3 working days.  Next day possible if ordered before 12 (T & C's apply). more about delivery .

For more info call 01244 913 320 or email us 

We aim to give you the best prices on all stoves, and include a free flue pipe. If you've seen it cheaper, call or email us the link.

Free flue design service  - we aim to beat any quote for similar products.


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150mm / 6" diameter KC Twin Wall Insulated Chimney System LFue damper.

Includes a locking band.

The Flue Damper helps to reduce the up-draught within the chimney.

A flue damper is a butterfly valve encased in the pipe length. The more air that goes in a stove, and the more draw through the flue - the hotter it burns.

A damper allows you to reduce the draw through the stove and therefore reduce the heat output.

It is not essential unless you have problems of excessive flue draft.

For use on solid fuel and gas/oil appliances. eg: wood burning stoves, gas, coal effect fires, oil boilers, solid fuel appliances. Insulation: compressed rockwool, all parts fully welded. Distance to combustibles is 60mm. (e.g. wood, plaster board).

KC Avant is HETAS Approved and is CE marked.

KC Twin Wall Insulated Chimney parts are secured together by using a Locking Band.

Twin wall chimney systems are referenced by their INTERAL diameter. The external diameter is 200mm.



Diameter 150mm internal / 200mm External
Colour Stainless
CE Certification EN1856-1 T450 N1 D V2 L50040 G60
Inner Material 316L Stainless Steel - 0.40mm thick
Outer Material 304 Stainless Steel - 0.40mm thick


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