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.

Storm Collar Flat

Schiedel

MSRP:

£62.41 Inc. VAT

Was:

MSRP:

£52.01 Ex. VAT

Was:

This Storm Collar Flat is used with a flashing kit to add additional protection against the ingress of rainwater.

MSRP:

£62.41 Inc. VAT

Was:

MSRP:

£52.01 Ex. VAT

Was:
Structural Wall Band (50mm)

Schiedel

MSRP:

£41.34 Inc. VAT

Was:

MSRP:

£34.45 Ex. VAT

Was:

95430180 This Structural Wall Band (50mm) is used to fix the chimney to a supporting wall and provides lateral support only at a fixed distance of 50mm. It can be used in conjunction w

MSRP:

£41.34 Inc. VAT

Was:

MSRP:

£34.45 Ex. VAT

Was:
Adjustable Trim Collar 35-45 Degree

Schiedel

MSRP:

£46.79 Inc. VAT

Was:

MSRP:

£38.99 Ex. VAT

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This Adjustable Trim Collar 35-45 Degree provides a flexible way of giving an aesthetically pleasing finish to any chimney flue system.They are very lightweight and easy to fit.

MSRP:

£46.79 Inc. VAT

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MSRP:

£38.99 Ex. VAT

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Adaptor Prima Plus to ICID Plus

Schiedel

MSRP:

£61.73 Inc. VAT

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MSRP:

£51.44 Ex. VAT

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The Adaptor Prima Plus to ICID is used to convert from the Prima Plus single wall connecting chimney flue pipe to the ICID system chimney. The Schiedel Eco ICID range has evolved into a...

MSRP:

£61.73 Inc. VAT

Was:

MSRP:

£51.44 Ex. VAT

Was:
Structural and Retrofit Wall Band Extensions

Schiedel

MSRP:

£39.05 Inc. VAT

Was:

MSRP:

£32.54 Ex. VAT

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These Structural and Retrofit Wall Band Extensions Available in 3 different sizes. Type W1 give

MSRP:

£39.05 Inc. VAT

Was:

MSRP:

£32.54 Ex. VAT

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Retrofit Wall Band

Schiedel

MSRP:

£92.58 Inc. VAT

Was:

MSRP:

£77.15 Ex. VAT

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This Retrofit Wall Band is used as part of teh Schiedel ECO ICID range, ICID Plus is ideal not only for traditional stoves but also for pellet stoves, biomass appliances, mini/micro CHP and even...

MSRP:

£92.58 Inc. VAT

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MSRP:

£77.15 Ex. VAT

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Appliance Connector (Open)

Schiedel

MSRP:

£43.79 Inc. VAT

Was:

MSRP:

£36.49 Ex. VAT

Was:

The ICID Insulated Appliance Connector is used to push into the appliance spigot with the male collar pointing upwards. It is used on solid fuel appliances and is sealed to the appliance with fire...

MSRP:

£43.79 Inc. VAT

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MSRP:

£36.49 Ex. VAT

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Loft Guard

Schiedel

MSRP:

£174.78 Inc. VAT

Was:

MSRP:

£145.65 Ex. VAT

Was:

This Loft Guard component is used to protect the flue form accidental touch within the loft space, preventing a fire from starting. Loft Guard Features

MSRP:

£174.78 Inc. VAT

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MSRP:

£145.65 Ex. VAT

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Angled Storm Collar

Schiedel

MSRP:

£66.10 Inc. VAT

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MSRP:

£55.08 Ex. VAT

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The Schiedel angled storm collar is a circular metal component that fits around the round pipe of a prefabricated chimney, positioned just above the flashing system. Its primary function is to...

MSRP:

£66.10 Inc. VAT

Was:

MSRP:

£55.08 Ex. VAT

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Uninsulated Increasing Adaptor

Schiedel

MSRP:

£66.78 Inc. VAT

Was:

MSRP:

£55.65 Ex. VAT

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The ICID Uninsulated Increasing Adaptor is used to start the connection from the appliance to the flue and allows increasing of the flue. It will sink into the appliance spigot and connect to a pipe...

MSRP:

£66.78 Inc. VAT

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MSRP:

£55.65 Ex. VAT

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Inspection Length

Schiedel

MSRP:

£442.70 Inc. VAT

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MSRP:

£368.92 Ex. VAT

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This Inspection Length is used to provide an inspection or cleaning access on Dry or FU applications under negative pressure conditions (N1). The inspection Box is uninsulated. Inspec

MSRP:

£442.70 Inc. VAT

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MSRP:

£368.92 Ex. VAT

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Wall Sleeve 45°

Schiedel

MSRP:

£73.74 Inc. VAT

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MSRP:

£61.45 Ex. VAT

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A Wall Sleeve to suit a 45° angle through a Masonry and Timber Wall.

MSRP:

£73.74 Inc. VAT

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MSRP:

£61.45 Ex. VAT

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Roof Support

Schiedel

MSRP:

£83.06 Inc. VAT

Was:

MSRP:

£69.22 Ex. VAT

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This item provides the chimney with lateral support as it passes through the roof space. The band is tightened around the chimney, and the side plates are rotated and fixed to the roof trusses to...

MSRP:

£83.06 Inc. VAT

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MSRP:

£69.22 Ex. VAT

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Screwfit Schiedel Adaptor ICID Plus To Tecnoflex Plus

Schiedel

MSRP:

£82.92 Inc. VAT

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MSRP:

£69.10 Ex. VAT

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The Chimney SCREWFIT Flue Adaptor Eco ICID to Tecnoflex Plus is used to convert the ICID system to the Tecnoflex system. Schiedel Chimney Systems offers a range of adaptors to connect

MSRP:

£82.92 Inc. VAT

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MSRP:

£69.10 Ex. VAT

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Ceiling Hanger 2pc - 200mm

Schiedel

MSRP:

£53.72 Inc. VAT

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MSRP:

£44.77 Ex. VAT

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This Ceiling Hanger 2pc - 200mm is used to provide an unsupported chimney with lateral support above roof level. It should be used in conjunction with guy wires or with rigid stays (provided by...

MSRP:

£53.72 Inc. VAT

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MSRP:

£44.77 Ex. VAT

Was:
Wall Sleeve 90 Degree

Schiedel

MSRP:

£30.92 Inc. VAT

Was:

MSRP:

£25.77 Ex. VAT

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A Wall Sleeve to suit a 90 degree angle through a Masonry and Timber Wall.

MSRP:

£30.92 Inc. VAT

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MSRP:

£25.77 Ex. VAT

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Items 65 to 80 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.