6-Inch Twin Wall Flue Pipes

6-inch twin wall flue pipe is designed to be used when an existing brick-built chimney is not present. This allows for the installation of a wood or gas stove in almost any location in the home.
Static Anti-Downdraft Cowl - 6" Twinwall Flue (150mm)
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£129.00

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Gas Cowl - 6" Twinwall Flue (150mm)
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£89.00

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800mm Length - 6" Twinwall Flue (150mm)
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£105.00

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1000mm 6" Twin Wall Flue Pipe - Black
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£105.00

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500mm 6" Twin Wall Flue - Black
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£79.00

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6" 45 Degree Elbow - Twin Wall Flue
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£69.00

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Black 6" - 6" Flat Appliance Adaptor
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£35.00

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135 Degree Long Tee & Cap 6" - Black
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£359.00

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100mm Length - 6" Twinwall Flue (150mm)
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£39.00

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Adjustable 45 Degree Bend Starter Length 450-575mm - 6" Twinwall Flue (150mm)
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£229.00

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Adjustable Starter Length 470-605mm - 6" Twinwall Flue (150mm)
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£149.00

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Adjustable Corner Support Bracket 270-520mm - 6" Twinwall Flue (150mm)
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£89.00

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Roof Brace Kit - 6" Twinwall Flue (150mm)
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£65.00

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6" 135 Degree Tee Powder Coated Black
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£209.00

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Black 250mm - 350mm Adjustable Twin Wall
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£79.00

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90 Degree Tee & Cap - 6" Twinwall Flue (150mm)
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£169.00

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15 Degree Bend - 6" Twinwall Flue (150mm)
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£69.00

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30 Degree Elbow - Black Twin Wall Flue
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£69.00

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Adjustable Base Support 6"
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£149.00

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Ventilated Firestop Pack
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£119.00

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6" Twin Wall Flues

Available in a stylish and low-maintenance black finish, our 6-inch twin wall flues are used when there is no constructed chimney available. They’re often found in period or new build properties without chimneys, as well as in many conversions and renovations where the chimney stack has been removed or the wood-burning stove's desired position is not where the chimney is located.

An insulated flue system is a low-cost alternative for removing the smoke and flue gases from wood burning, multi-fuel, gas, or pellet stoves. A 6" diameter double-wall flue system can be used both indoor and outdoor and even pass through walls, floors, and roofs.

The twin wall flue system is waterproof, corrosion-resistant, and made from stainless steel but can be powder-coated black to match your appliance. There are twin wall insulated flue components to suit most requirements, whether you need long, short, or adjustable length, or 15-, 30- or 45-degree angled bends. We also have a large selection of chimney cowls and guards for your flue.

Frequently Asked Questions

What are the rules for twin wall flue installation?

When installing a twin wall flue pipe, there are specific regulations and guidelines that must be followed to ensure safety and compliance with building codes. Key rules include maintaining a safe distance between the flue pipe and any combustible materials, which is typically at least 50mm, although this may vary based on local regulations and the manufacturer’s specifications. The flue must also extend to a certain height above the roofline to ensure proper draft and prevent downdrafts; typically, this is 600mm above the highest point of the roof within a 2.3-meter radius. Additionally, the flue system must be securely supported and should not rely on the appliance for support. Always consult a qualified installer to ensure compliance with all relevant regulations.

Why use a twin wall flue pipe?

A twin wall flue pipe is used primarily for its insulation properties, which help maintain the temperature of the exhaust gases as they travel through the flue. This is especially important when the flue passes through unheated areas, such as lofts or outside walls, where the temperature drop could cause condensation or reduce the efficiency of the draft. The twin wall construction, with an insulating layer between the inner and outer pipes, ensures that the flue gases stay hot, improving the performance of your stove or fireplace and reducing the risk of condensation or tar build-up within the flue. Additionally, twin wall flue pipes are safe to use where there is a risk of the flue coming into contact with combustible materials, as the outer layer remains cooler than a single wall pipe.

Can you cut down twin wall flue pipe?

Cutting down a twin wall flue pipe is not recommended, as it can compromise the integrity and safety of the flue system. Each section of a twin wall flue pipe is precisely manufactured to ensure proper insulation and secure connections. Cutting the pipe will damage the insulating layer and make it almost impossible to achieve a proper seal when reassembling the sections. If you need a specific length of flue pipe, it’s best to purchase an adjustable length or pre-manufactured section that meets your requirements.

How wide is a 6” twin wall flue pipe?

The width of a twin wall flue pipe is determined by the diameter of the inner pipe, with the outer pipe being larger due to the insulation layer. For a 6-inch twin wall flue pipe, the inner diameter is 6 inches (150mm), and the outer diameter is typically around 8 inches (200mm). This additional width is necessary to accommodate the insulating layer between the inner and outer pipes, which ensures the safe and efficient operation of the flue system. Always ensure that your installation allows sufficient space for the outer diameter of the twin wall flue pipe.

What materials are twin wall flue pipes made from?

Twin wall flue pipes are typically constructed from high-grade stainless steel for both the inner and outer layers, which provides durability and resistance to corrosion. The inner pipe is usually made from 316-grade stainless steel, known for its high resistance to heat and acidic condensation, making it ideal for withstanding the harsh conditions inside the flue. The outer pipe is often made from 304-grade stainless steel, which is durable and resistant to weathering. Between the two layers, an insulating material, often mineral wool or ceramic fibre, is used to maintain the temperature of the flue gases and ensure safe operation. This combination of materials makes twin wall flue pipes reliable and long-lasting in various installations.

Our HETAS and CE-approved 6-inch twin wall flue kits are simple, clean and easy to install, however we recommend a competent person to fit this product. Shop now for free UK delivery when you spend over £100.

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