Twin Wall Flue Systems

Twin-wall flue systems provide a safe, reliable way to vent a wood-burning stove, solid-fuel appliance, or biomass boiler in properties without a traditional brick chimney. A twin wall flue system is an insulated, modular stainless steel chimney used to vent heating appliances, consisting of two stainless steel pipes separated by insulation that keeps combustion gases flowing efficiently while the outer wall remains cool enough to pass safely through walls, ceilings, and roofs. Browse our complete range below to find the right twin wall chimney flue for internal or external installations, from straight lengths and elbows to firestop plates, locking bands, and terminals.

Ventilated Support Plate - 2 Piece

Schiedel

MSRP:

£110.41 Inc. VAT

Was:

MSRP:

£92.01 Ex. VAT

Was:

Ventilated Support Plate – VENTILATED SUPPORT PLATE (GALVANISED PLATE WITH S/S BAND) The support plate is used where the chimney passes through a combustible floor, and the weight of the chimney has...

MSRP:

£110.41 Inc. VAT

Was:

MSRP:

£92.01 Ex. VAT

Was:
90 Degree Inspection Bend

Schiedel

MSRP:

£242.15 Inc. VAT

Was:

MSRP:

£201.79 Ex. VAT

Was:

This 90 Degree Inspection Bend is used to provide a change of direction on a connecting flue pipe. The cover plate on the middle section may be removed to allow inspection and cleaning access.

MSRP:

£242.15 Inc. VAT

Was:

MSRP:

£201.79 Ex. VAT

Was:
Insulated Tapered Terminal

Schiedel

MSRP:

£138.55 Inc. VAT

Was:

MSRP:

£115.46 Ex. VAT

Was:

DN8A038125ECO ICID is a twin wall insulated flue manufactured with a 316L grade stainless steel liner and a stainless steel case.

MSRP:

£138.55 Inc. VAT

Was:

MSRP:

£115.46 Ex. VAT

Was:
Wall Support Side Plates

Schiedel

MSRP:

£111.82 Inc. VAT

Was:

MSRP:

£93.18 Ex. VAT

Was:

The wall support sideplates can be utilised alongside a top plate or a top plate with drain at the base of the vertical chimney, or with a top plate serving as an intermediate wall support. They may...

MSRP:

£111.82 Inc. VAT

Was:

MSRP:

£93.18 Ex. VAT

Was:
293mm Effective Length

Schiedel

MSRP:

£74.40 Inc. VAT

Was:

MSRP:

£62.00 Ex. VAT

Was:

Effective Chimney Pipe Lengths are used to make up spaces in order for the system to operate. The chimney flue pipe lengths can be applied either vertically or horizontally. The shorter chimney pipe...

MSRP:

£74.40 Inc. VAT

Was:

MSRP:

£62.00 Ex. VAT

Was:
Draught Stabiliser (Twin Wall)

Schiedel

MSRP:

£98.35 Inc. VAT

Was:

MSRP:

£81.96 Ex. VAT

Was:

The Draught Stabiliser Section is installed where there is excessive draught on a system. This is connected onto the system usually via a 90° tee.

MSRP:

£98.35 Inc. VAT

Was:

MSRP:

£81.96 Ex. VAT

Was:
Schiedel ICID Screwfit Anchor Plate (Screwfit Spigot)

Schiedel

MSRP:

£138.55 Inc. VAT

Was:

MSRP:

£115.46 Ex. VAT

Was:

The Schiedel SCREWFIT Anchor Plate is used when commencing an installation with a fire chest, or when extending an existing brick or masonry chimney stack, an anchor plate must be used. The plate...

MSRP:

£138.55 Inc. VAT

Was:

MSRP:

£115.46 Ex. VAT

Was:
Raincap with 10mm Sparkguard

Schiedel

MSRP:

£60.14 Inc. VAT

Was:

MSRP:

£50.12 Ex. VAT

Was:

This Raincap with 10mm Sparkguard is used to terminate the system and also prevents ingressive rain entering it, the 10mm mesh offers protection against sparks leaving the flue system onto easily...

MSRP:

£60.14 Inc. VAT

Was:

MSRP:

£50.12 Ex. VAT

Was:
Adjustable Trim Collar 0-20 Degree

Schiedel

MSRP:

£44.72 Inc. VAT

Was:

MSRP:

£37.27 Ex. VAT

Was:

The Adjustable Trim Collar 0-20 Degree provides a very flexible way of giving an aesthetically pleasing finish to any chimney flue system.These collars are lightweight and easy to fit.

MSRP:

£44.72 Inc. VAT

Was:

MSRP:

£37.27 Ex. VAT

Was:
Support Plate (Non Combustible Floor)

Schiedel

MSRP:

£49.09 Inc. VAT

Was:

MSRP:

£40.91 Ex. VAT

Was:

Non Combustible Support Plate The support plate is used where the chimney passes through a non combustible floor, and the wei

MSRP:

£49.09 Inc. VAT

Was:

MSRP:

£40.91 Ex. VAT

Was:
160mm Effective Length

Schiedel

MSRP:

£61.02 Inc. VAT

Was:

MSRP:

£50.85 Ex. VAT

Was:

160mm Effective Length are used to make up spaces in order for the system to operate. The chimney flue pipe lengths can be applied either vertically or horizontally. The shorter chimney pipe lengths...

MSRP:

£61.02 Inc. VAT

Was:

MSRP:

£50.85 Ex. VAT

Was:
Cantilever Support

Schiedel

MSRP:

£99.62 Inc. VAT

Was:

MSRP:

£83.02 Ex. VAT

Was:

The Cantilever Supports are used once the position of the support has been established in relation to the chimney route. The plates are secured to the wall using expansion bolts to ensure adequate...

MSRP:

£99.62 Inc. VAT

Was:

MSRP:

£83.02 Ex. VAT

Was:
Schiedel ICID Screwfit Adaptor from Flex to ICID

Schiedel

MSRP:

£90.26 Inc. VAT

Was:

MSRP:

£75.22 Ex. VAT

Was:

The Schiedel SCREWFIT Adaptor is used to connect from Schiedel Tecnoflex flexible flue liner onto ICID at the top of an existing chmney stack. Suitable for use on solid fuel

MSRP:

£90.26 Inc. VAT

Was:

MSRP:

£75.22 Ex. VAT

Was:
Adjustable Trim Collar 20-35 Degree

Schiedel

MSRP:

£45.71 Inc. VAT

Was:

MSRP:

£38.09 Ex. VAT

Was:

The Adjustable Trim Collar 20-35 Degree provides a flexible way of giving an aesthetically pleasing finish to any chimney flue system. These are lightweight and easy to fit. <

MSRP:

£45.71 Inc. VAT

Was:

MSRP:

£38.09 Ex. VAT

Was:
Firestop Plate 2 Piece

Schiedel

MSRP:

£44.77 Inc. VAT

Was:

MSRP:

£37.31 Ex. VAT

Was:

This fire stop plate This fire stop plate is used exclusively where the chimney passes through a non combustible floor. The two halves of the plate are located around the chimney section and fastened...

MSRP:

£44.77 Inc. VAT

Was:

MSRP:

£37.31 Ex. VAT

Was:
Adaptor Prima Smooth to ICID Plus

Schiedel

MSRP:

£61.60 Inc. VAT

Was:

MSRP:

£51.33 Ex. VAT

Was:

This Adaptor Prima Smooth to ICID Plus is used to convert from Prima Smooth to ICID Plus. The Schiedel Eco ICID range has evolved into a multi-application system adaptable for Dry (D), Fu (W) and...

MSRP:

£61.60 Inc. VAT

Was:

MSRP:

£51.33 Ex. VAT

Was:

Items 49 to 64 of 87 total

Types of Twin Wall Flue Systems

Twin wall chimney systems are categorised by how and where they're installed. Understanding the differences helps you select components suitable for your property and routing requirements.

Internal Twin Wall Systems

Internal twin wall flue pipe runs vertically through the building, passing through floors, ceilings, and the roof. These systems sit within the building envelope, offering better weather protection and a neater finish - though each floor penetration requires a ceiling plate and firestop to maintain safe clearances from combustible materials. Internal routing is ideal when the stove is centrally located in the house and external installation isn't practical or desirable. Where the flue passes through a loft or storage area, it must be accessible for inspection if boxed in.

External Twin Wall Systems

External twin-wall systems run along the outside face of a building, attached with wall-support brackets typically spaced at two-metre intervals. Twin wall flue systems are often preferred in retrofitting scenarios due to their flexibility - particularly for properties without an existing chimney or where internal routing through multiple floors would be disruptive. External runs need a wall sleeve where the flue pipe exits the building and weatherproof flashings at the roof line. Twin-wall flues can appear visually bulky due to their internal insulation layer, so many customers choose a matt black finish or a powder-coated option for a cleaner look against exterior walls.

Adjustable Length Systems

No two buildings share identical ceiling heights or roof pitches, so adjustable and telescopic components are essential. These include telescopic extension sections, offset elbows (available at 15°, 30°, and 45° angles), and adaptors for connecting to a single-wall flue pipe at the stove. Maximising straight vertical runs in flue installation is essential for effective airflow - each bend reduces draft, so keep the route as direct as possible. Twin-wall flue systems have an inner diameter of 5 to 8 inches, providing flexibility for different heating appliance sizes and building configurations.