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DTW 45 degree wall sleeve (for when going through wall)

Colour & Internal Diameter
Silver 5"
Silver 6"

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

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"

You might decide to use a metal sleeve through the wall. Any gaps around the sleeve can be filled with mortar. Note that most fitters do not use a sleeve but just push the pipe through and fill the gap with a mortar/vermiculite mix even though Building regulations state that there should be a sleeve "if the pipe is likely, through heat expansion, to damage the building or the pipe".

I have used a sleeve on some jobs and not on other jobs. If not using a shield I fill the gap between the pipe and the building with Rockwool insulation (available from many merchants but it MUST be Rockwool brand as other brands are not fireproof). My thoughts here are that, as there is no expansion issue, no sleeve is required.

Stove Fitter's Warehouse offers a FREE Twin Wall Design Service.

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.

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".

Customer Reviews

Based on 209 reviews
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Brian Gerrard
Twin Wall Flu Order Number 15652

A family friend pointed in the direction of Stovefitters Warehouse as he had heard good things about them, best move I have made. From my initial tentative contact with the company I cannot speak highly enough about them. I sent in my very primitive sketches I had drawn up and was asked some very simply questions and for some measurements that where required. In no time at all I was sent my first set of drawings for me to scrutinise, noticed that the initial design was excellent there was a need for a couple of changes. Once these changes had been made I was sent the final set of drawings all of this was being completed via email and I confirmed these where exactly what I was after. The above process had only taken a couple of days and was seamless. I placed my order and received this I believe within 5 days of payment, all the items where well packed and after a quick check I confirmed all the chimney was in good order. I cannot fault the service I have received from start to finish and would highly recommend dealing with Stovefitter Warehouse TOP JOB.

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Simon Flower
External twin-wall flue design and supply

Good service from stovefitters (as previously - I'm a repeat customer). I haven't used the chimney design service before and it's a great service - from the amount of material on the web site to help, through the individual design and drawing to the supply of parts. People at the company are responsive to questions and authoritative. All went smoothly, though I've yet to complete the installation. In previous experiences the installation went as smoothly as the ordering (and the parts are still working well 7 years later).

Order number 15048