5-Inch Twin Wall Flue

5-inch twin wall flue is the most popular size on offer at StovesAreUs, so we have a variety of options to choose from here. Twin wall flue systems are designed to allow the installation of a wood burner in almost any situation and are insulated to keep flue gases warm. Explore the full collection below for free UK delivery over £100.
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Items 41 - 60 of 61

Items 41 - 60 of 61

Powder coated black H cowl
From £109.00
  • Static anti-downdraught design for twin wall flue systems
  • Isolates combustion gases from prevailing winds
  • Comes with a 10-year warranty
  • CE and HETAS approved for safety and compliance
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Adjustable Twin Wall Flue Pipe - Black
From £119.00
  • Adjustable length extends from 500mm to 880mm
  • Suitable for internal or external flue systems
  • Requires only 60mm clearance from combustibles
  • Fully welded and insulated with high-density rockwool
  • CE and HETAS approved for safety and compliance

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Adjustable 5" Base Support - Black
From £239.00
  • Adjustable base support from 50mm to 80mm
  • Supports up to 20m of twin wall flue pipe
  • Suitable for solid fuel, gas, and oil appliances
  • CE and HETAS approved for compliance
  • Available in stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

5" Guy Wire Bracket
£15.00
  • Supports flue systems extending 1.5m beyond last structural support
  • Allows guy wire installation at 120° intervals for stability
  • Optional 30m guy wire pack available for added bracing
  • CE and HETAS approved for safety and compliance
  • Available in stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Ventilated Firestop Pack - 5" Twinwall Flue (125mm)
£109.00
  • Includes 2 ventilated firestop plates and a guy wire bracket
  • Provides load-bearing support through combustible floors
  • CE and HETAS approved for solid fuel appliance installations
  • Quick and easy installation
  • Available in matt black or white finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Lead 36-45 Degree Roof Flashing - 5" Twinwall Flue (125mm)
£130.00
  • Dimensions: 850mm (L) x 550mm (W) base size
  • Suitable for 36-45° pitched tiled or slate roofs
  • Easy-fit pull tab design for fast installation
  • CE & HETAS approved for safety and compliance
  • Durable, pleat-free construction with no safety concerns

In Stock

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Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

500mm Testing Length - 5" Twinwall Flue (125mm)
£129.00
  • Suitable for solid fuel and gas appliances.
  • 304 stainless steel outer with a high-temperature black finish.
  • 316 stainless steel inner with 200kg/m³ rockwool insulation.
  • Supplied with a Locking Band

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HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Gas Cowl - 5" Twinwall Flue (125mm)
From £89.00
  • 60mm clearance required from combustibles
  • Suitable for gas appliances only
  • Fully welded and insulated with high-density rockwool
  • CE and HETAS approved
  • Includes free locking band and quick-fit design

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Black Twin Wall to Flue Liner Adaptor
From £59.00
  • Insulated adaptor for connecting twin wall flue to flexible flue liner
  • Suitable for solid fuel, gas and oil fired systems
  • 60mm minimum clearance from combustibles required
  • CE and Hetas approved for UK building regulation compliance
  • Fully welded, high-density rockwool insulation for heat safety

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Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

30 Degree Twin Wall Elbow - Black
From £59.00
  • Suitable for internal or external flue installations
  • 30 degree elbow allows for offset to navigate obstacles
  • Requires only 60mm clearance from combustibles
  • Fully welded and insulated with high-density rockwool
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

15 Degree Twin Wall Elbow - Black
From £59.00
  • 15 degree bend allows for flue offset around obstacles
  • Suitable for internal or external flue installations
  • Requires only 60mm clearance from combustibles
  • Fully welded and insulated with high-density rockwool
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

90 Degree Tee 5" - Black
£149.00
  • 90 degree tee enables rear stove connection and flue cleaning
  • Suitable for internal or external flue installations
  • Requires only 60mm clearance from combustibles
  • Fully welded and insulated with high-density rockwool
  • Available in stainless steel or matt black

In Stock

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

350mm-500mm Adjustable Twin Wall Flue - Black
From £89.00
  • Adjustable length ideal for walls with uncertain measurements
  • Suitable for internal or external flue installations
  • Requires only 60mm clearance from combustibles
  • Fully welded and insulated with high-density rockwool
  • Available in stainless steel or matt black

In Stock

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Rotating Cowl - 5" Twinwall Flue (125mm), Black
From £209.00
  • Wind-driven revolving cowl increases flue draught using spinning vanes
  • Suitable for gas, oil, or solid fuel appliances
  • Requires only 60mm clearance from combustibles
  • CE and HETAS approved for safety and compliance
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Chest Mounting Plate Including Liner Adaptor
From £85.00
  • Dimensions: 400mm x 400mm chest mounting plate
  • Connects 5" flexible flue liner to 5" twin wall system
  • Ideal when chimney stack is removed and flue exits through roof
  • Quick and easy to install; CE and HETAS approved
  • Available in stainless steel or matt black finish

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Roof Flashing Fixing Kit
£15.00
  • Complete kit for securing Masterflash flashings
  • Includes 8 screws, drill bit & 80ml silicone
  • Fits sizes No.3–No.9 (kit quantity varies)
  • CE approved components
  • All-in-one solution for quick, clean flashing installation

In Stock

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Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

No 6 Metal Grey Silicone Roof Flashing - 4-5" Twinwall Flue (100-125mm)
£55.00
  • Temperature resistant from -74°C to 260°C for reliable performance
  • Suitable for profiled sheeting and flat panel surfaces
  • Clean, pleat-free silicone design for a neat finish
  • CE & HETAS certified for quality and safety
  • Optional fixing kit includes screws, drill bit, and silicone sealant

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Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

6" Loft Mesh Kit
£189.00
  • Dimensions: 900mm (H) x 350mm (W) mesh panels (x4)
  • Meets building regulations for flue enclosure in loft areas
  • Prevents combustible materials from contacting the chimney
  • Includes fixing clips, joist support, and top clamp for easy install
  • CE & HETAS approved for safety and compliance

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Draft Booster Chimney Fan, Black
£595.00
  • Enhances chimney draught for easier fire lighting
  • Reduces smoke and soot when refueling
  • Improves combustion and room heat-up time
  • DIY plug-and-play installation
  • Durable, corrosion-resistant design

In Stock

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Cone Top Cowl - 5" Twinwall Flue (125mm)
From £55.00
  • Fully welded and rockwool insulated for flue protection
  • Designed for use where rain protection isn't required
  • Only 60mm clearance needed from combustibles
  • CE & HETAS approved for safety and compliance
  • Available in stainless steel or matt black

In Stock

HETAS Approved
Warranty Lifetime

Pay in instalments from 6 to 36 months

0% for 4 months or 6-36 months instalments.

Twin Wall 5-Inch Flue

A 5-inch twin wall flue kit from this range can be used when there is no constructed chimney available. They are often used in period or new build properties without chimneys, as well as in conversions and renovations where the chimney stack has been removed or the stoves desired position is not where the chimney is located.

In this range, you’ll find a choice of 5-inch twin wall flue pipes in black, the perfect versatile colour for completing your set up. On top of this, there are twin wall insulated flue components to suit most requirements in this range, whether it be long, short, or adjustable lengths, or 15-, 30- or 45-degree angled bends.

Frequently Asked Questions

What is the distance to combustible material for a 5" twin wall flue?

Every piece of twin wall flue in our collection has been tested rigorously and can be installed within 60mm of non-combustible material. This is a great advantage when fitting a flue system in a loft space or past ceiling joists as it means your system can be positioned relatively close to the timber work.

What is the outside diameter of a 5" twin wall flue pipe?

The outside diameter of a 5" twin wall flue system measures 7" (175mm). The inner and outer steel skin of our twin wall flue pipe is packed with high-quality insulation which keeps the flue gases warm for a great draught and also ensures the flue can be installed within 60mm of combustible materials.

Can I install a twin wall flue system myself?

Installing a twin wall flue system is a considerable task and may involve equipment like tall ladders or scaffolding if access to your roof is required. Connecting sections of twin wall flue pipe is technically very straightforward and specialist skills are not required, you'll still need to ensure that you follow building regulations for your own safety.

Buy a 5-inch twin wall flue pipe or kit from StovesAreUs today. And make sure to browse our wider range of chimney essentials for flexible flue liners, chimney cowls, and more.

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