Twin wall: 45 degree wall sleeve (for when going through wall)

Materials always in stock (4 UK-wide depots). 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).

Slide through the wall and cut to length as required. Add mortar around outside of it or Rockwool insulation. Make sure it is Rockwool (some other brands not fireproof).

Diameter of 5" sleeve: 9"

Diameter of 6" sleeve: 10"

Stove Fitter's Warehouse offers a full Twin Wall Design Service with all designs prepared within our Twin Wall Design Studio. Contact us for further details (

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.

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

Customer Reviews

Based on 142 reviews
Excellent Customer Service 5*****

Decided to take the plunge and install a stove in the man cave. Spoke to Julian and Aaron a few times. The Guys gave me great advice and could not help me enough. Excellent Service would use the guys again as may have another project next year watch this space 👍

Great service and products

We actually purchased a whole twin wall flue system from Julian and the service has been great. He was very helpful and knowledgable. The flue itself seems to be very sturdy, we hope to light it this weekend!

The Hobbit Stove Review

Last week I installed my Hobbit stove, purchased from Stove Fitter’s Warehouse. I am honestly very impressed. I have the 4” to 5” conversion for a double skinned stainless flue, finished off with a stainless steel trim plate on the roof.
The install was for my boat and, as I undertook the installation myself, undoubtedly had many questions. The team at SFW were fantastic, always willing to help with questions and heir support has been great regarding distances etc.
The stove itself operates very efficiently with both wood and stove, for such a small one, and generates a 4kw output. I get an excellent draw and it is certainly gathered a lot of positive commentary!
The Dura flue system is easy to assemble well made. I secured the stove to a slate hearth (which is itself secured to the floor) using anchor bolts.
Overall, a quality stove supplied by a great team! I spent a lot of hours researching the different stoves and I am very happy with my choice. I highly recommend it for serious consideration, especially if you have a limited space to install a stove.

Twin wall Flue

Fitted a twin wall flue for the first time, the parts fitted together with ease and were very self explanatory. Had a couple issue whilst fitting, but just rang up for advise and had great service in return.

Twin wall flue system

Good product fitted as described