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.

Ceiling Hanger (1pc) - 180mm

Schiedel

MSRP:

£37.32 Inc. VAT

Was:

MSRP:

£31.10 Ex. VAT

Was:

This item 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 others) which should be attached to the bracket and then secured to suitable...

MSRP:

£37.32 Inc. VAT

Was:

MSRP:

£31.10 Ex. VAT

Was:
Telescopic Flue Roof Brace Kit

Schiedel

MSRP:

£151.63 Inc. VAT

Was:

MSRP:

£126.36 Ex. VAT

Was:

This telescopic flue roof brace kit provides lateral support to an unsupported chimney above roof level. The telescopic legs have been designed to prevent water ingress and to allow maximum flexibility in positioning of the clamp band around the...

MSRP:

£151.63 Inc. VAT

Was:

MSRP:

£126.36 Ex. VAT

Was:
Guy Wire Bracket

Schiedel

MSRP:

£32.42 Inc. VAT

Was:

MSRP:

£27.02 Ex. VAT

Was:

This Guy Wire Bracket 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 others) which should be attached to the bracket and then secured...

MSRP:

£32.42 Inc. VAT

Was:

MSRP:

£27.02 Ex. VAT

Was:
Ceiling Joist Support

Schiedel

MSRP:

£130.22 Inc. VAT

Was:

MSRP:

£108.52 Ex. VAT

Was:

This Ceiling Joist Support component is used to provide support for the ICID chimney through ceilings.

MSRP:

£130.22 Inc. VAT

Was:

MSRP:

£108.52 Ex. VAT

Was:
Ceiling Joist Support Arms (Pair)

Schiedel

MSRP:

£38.74 Inc. VAT

Was:

MSRP:

£32.28 Ex. VAT

Was:

Ceiling Joist Support Arms (Pair) Type 570 – ICID Plus Support Components used in combination with the ceiling joist support to provide adjustment and support. Support Arm Features Strong and robust Pre-cut screw holes

MSRP:

£38.74 Inc. VAT

Was:

MSRP:

£32.28 Ex. VAT

Was:
Structural Locking Band for Bends

Schiedel

MSRP:

£10.40 Inc. VAT

Was:

MSRP:

£8.67 Ex. VAT

Was:

This item provides a locking mechanism for ICID bends. The Twist-lock bayonet jointing system for ICID systems is secured by this structural locking band. **Black items are NON Returnable**

MSRP:

£10.40 Inc. VAT

Was:

MSRP:

£8.67 Ex. VAT

Was:
Structural Locking Band

Schiedel

MSRP:

£27.62 Inc. VAT

Was:

MSRP:

£23.02 Ex. VAT

Was:

The Structural Locking Bands are purchased separately. It is used instead of a standard locking band in a situation where extra structural support is required. For example, where the chimney is 1.5m above the last support or above the roof. This also...

MSRP:

£27.62 Inc. VAT

Was:

MSRP:

£23.02 Ex. VAT

Was:

Items 81 to 87 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.

Twin Wall Flue Systems

Ceiling Hanger (1pc) - 180mm

Telescopic Flue Roof Brace Kit

Guy Wire Bracket

Ceiling Joist Support

Ceiling Joist Support Arms (Pair)

Structural Locking Band for Bends

Structural Locking Band

Types of Twin Wall Flue Systems

Internal Twin Wall Systems

External Twin Wall Systems

Adjustable Length Systems