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 - 58 of 58

Items 41 - 58 of 58

5" Guy Wire Bracket
  • 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
£15.00

Pay in instalments from 6 to 36 months

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Ventilated Firestop Pack - 5" Twinwall Flue (125mm)
  • 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
£109.00

Pay in instalments from 6 to 36 months

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Storm Collar - 5" Twinwall Flue (125mm), Steel
  • Prevents water ingress around roof flashing for weatherproof seal
  • 10-year warranty for long-lasting protection
  • CE & HETAS approved for safety and compliance
  • Quick to install with individually boxed components
  • Available in stainless steel or matt black finish
From £25.00

Pay in instalments from 6 to 36 months

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5" Base Support - Black
  • Supports up to 20m of twin wall flue for tall installations
  • Adjustable from 50mm-80mm for flexible positioning
  • Suitable for solid fuel, gas, and oil appliances
  • CE & HETAS approved for safety and compliance
  • Available in stainless steel or matt black finish
From £139.00

Pay in instalments from 6 to 36 months

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250mm Twin Wall Flue - Black
  • Length: 250mm twin wall insulated flue section
  • Only 60mm clearance required from combustibles
  • Fully welded and insulated with high-density rockwool
  • CE & HETAS approved for safety and compliance
  • Available in Stainless Steel or Matt Black finish
From £39.00

Pay in instalments from 6 to 36 months

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Lead 36-45 Degree Roof Flashing - 5" Twinwall Flue (125mm)
  • 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
£130.00

Pay in instalments from 6 to 36 months

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Lead 25-35 Degree Roof Flashing - 5" Twinwall Flue (125mm)
  • Dimensions: 450mm (L) x 450mm (W) base size
  • Suitable for 25–35° pitched tiled or slate roofs
  • Pull tab design for easy, accurate sizing
  • CE & HETAS approved for certified safety
  • Durable, pleat-free construction with no safety concerns
£115.00

Pay in instalments from 6 to 36 months

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Roof Flashing Fixing Kit
  • 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
£15.00

Pay in instalments from 6 to 36 months

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Square 45 Degree 5" Finishing Plate - Black
  • Dimensions: 365mm (W) external, 175mm internal diameter
  • Provides a neat wall finish for 5" twin wall flues
  • Suitable for 45° or 90° flue wall penetrations
  • CE & HETAS approved for compliance
  • 10-year warranty for peace of mind after purchase
£29.00

Pay in instalments from 6 to 36 months

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No 6 Metal Grey Silicone Roof Flashing - 4-5" Twinwall Flue (100-125mm)
  • 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
£55.00

Pay in instalments from 6 to 36 months

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No 2 Tile Black EPDM Roof Flashing - 5" - 8" Twinwall Flue (125-200mm)
  • Dimensions: 760mm (L) x 660mm (W) base size
  • Fits internal flue diameters from 125mm to 275mm (5"-8")
  • Suitable for roof pitches between 20-45°
  • Withstands temperatures up to 135°C
  • Durable, cuttable EPDM design for long-lasting performance
£50.00

Pay in instalments from 6 to 36 months

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Powder Coated Black Wall Bracket
  • Adjustable from 50mm to 80mm for flexible wall support
  • Suitable for 5" twin wall flue with 125mm internal diameter
  • Made from durable 316 grade stainless steel
  • Approved for use with solid fuel, gas, and oil appliances
  • CE and Hetas certified for safety and compliance
From £20.00

Pay in instalments from 6 to 36 months

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Masterflash Roof Flashing 5" Flues
  • Handles temperatures from -50°C to 135°C for weather resistance
  • EPDM flashing for profiled or flat panel roof surfaces
  • Clean, pleat-free design for a neat finish
  • CE & Hetas approved for compliance and safety
  • Optional fixing kit with screws, drill bit, and silicone
£40.00

Pay in instalments from 6 to 36 months

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6" Loft Mesh Kit
  • 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
£189.00

Pay in instalments from 6 to 36 months

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Draft Booster Chimney Fan
  • 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
From £595.00

Pay in instalments from 6 to 36 months

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Cone Top Cowl - 5" Twinwall Flue (125mm)
  • 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
From £55.00

Pay in instalments from 6 to 36 months

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Locking Band - 5" Twinwall Flue (125mm), Black
  • Connects two twinwall flue components securely
  • Required at every joint for safe installation
  • CE & HETAS approved for safety and compliance
  • Supplied as standard with most twinwall lengths or bends
  • Available in stainless steel or matt black finish
From £12.00

Pay in instalments from 6 to 36 months

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Heat Resistant Silicone Cartridge - Black - 310ml
  • High temperature resistance up to 300°C
  • One-part, ready-to-use silicone sealant
  • Cures with atmospheric moisture for strong bond
  • Forms a flexible, highly elastic silicone rubber
  • Ideal for sealing in heat-exposed flue installations
£19.95

Pay in instalments from 6 to 36 months

Estimated 3-5 Day Delivery

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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