DTW Ventilated firestop support set (used to support flue on joists)

Colour & Internal Diameter
Silver 5"
Silver 6"
Black 5"
Black 6"

Doing it yourself? Visit our "How to install twin wall flue" page.

This system provides ventilation to prevent heat build-up within an enclosed space (passing through from one room to another for example). You can also buy the bottom plate on its own - useful for passing into a roof void.

If you don't want to see the "slots" or look through them add one of these.

Three parts to this:

1. Plate that takes the weight that goes on top (on joists or wooden floor) and has little upstands of metal to differentiate it from (3)

2.Clamp to stop twin wall falling through (1)

3. Cover plate so everything looks neat on the ceiling.

The pics below are mockups but you should get the idea of how it all works.

Top plate has lugs and NO combustible material should be inside the lugs area.

Lugs as seen from BELOW

Looking up we would see something like this... polythene would not be in hole of course. The flue would be at least 7cm from the wood and hence you should see no cobustible materials through those events!

Top tip: No fire cement or glue of any kind is used when connecting twin wall pipe to twin wall pipe - it is just push-fit (with a locking band for added security). When to use fire cement on flue joints? Use the SEARCH function and type "sealing flue joints".

This is a twin wall clip-together chimney part used to build a new chimney. Twin wall clip-together chimney can be as close as 5-7cm to combustible materials (so is also useful for adding atop a stove to bypass a wooden beam).

Stove Fitter's Warehouse offers a full Twin Wall Design Service with all designs prepared within our Twin Wall Design Studio: https://www.stovefitterswarehouse.co.uk/products/chimney-design-to-building-regulations

Duraflue Twin Wall was launched to the market during 2014 and, due to its high quality and innovative design, is already a favourite amongst professional stove fitters. Brackets are strong whereas other brands may be spindly and quality is premium. Do it once - do it good.

Customer Reviews

Based on 192 reviews
Douglas Brown
Peanut 3

Product great and huge help from the team as this was the first stove I had fitted. Only one issue with the 45 deg cover plate did not fit very well. Gaps around the pipe when installing and not a tight fit. All else good. Many thanks Dougie

Bruce Coker
Excellent experience

Couldn’t have been mmore helpful, from trying to resolve my delivery requirements to patiently answering my many questions.

Excellent communication, always prompt and friendly – and the website is a mine of information for anyone contemplating a DIY stove installation. I’ve fitted a lot of stoves, in a lot of different situations – houses, vans, trailers, boats – but I still learned a vast amount from SW’s extensive documentation.

As a bonus, I really appreciated being able to get everything I needed for my current project from one place.

Would definitely use again.