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Chimney Flues: Quality Flue Systems for Every Need in the UK

Our chimney flue systems cater to a wide variety of needs, from domestic to commercial applications. With different diameters, finishes, and styles such as TWPro, Sflue, and IL, you're guaranteed to find the perfect fit for your fireplace setup.
Our chimney flue systems cater to a wide variety of needs, from domestic to commercial applications. With different diameters, finishes, and styles such as TWPro, Sflue, and IL, you're guaranteed to find the perfect fit for your fireplace setup.
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Fireplaces & Hearths
Flexible Liner
Chimney Flue
Connecting Pipes
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Installation Parts
After Care Parts

Call our TWPro advisers on 01670 206 999 if you need any helping with your system design.

£1.93 £6,070.99
Showing 20 of 1378 items
DM36 - 45° flue entry kit (4 parts)

DM36 - 45° flue entry kit (4 parts)

59-130709
£213.99 (including VAT)
Out of stock
DM36 - 490mm sq. capping for render

DM36 - 490mm sq. capping for render

59-130710
£73.99 (including VAT)
Out of stock
DM36 - 690mm sq. capping for brickwork

DM36 - 690mm sq. capping for brickwork

59-130711
£108.99 (including VAT)
Out of stock
DM36 - 360mm square x 250mm high access casing

DM36 - 360mm square x 250mm high access casing

59-130712
£62.99 (including VAT)
Out of stock
DM36 - 350mm square x 250mm high casing & soot door

DM36 - 350mm square x 250mm high casing & soot door

59-130713
£234.99 (including VAT)
Out of stock
DM36 - 570mm square corbel for brickwork

DM36 - 570mm square corbel for brickwork

59-130715
£99.99 (including VAT)
Out of stock
DM36 - 150mm ID 360mm sq. DM support block

DM36 - 150mm ID 360mm sq. DM support block

59-130716
£95.99 (including VAT)
Out of stock
DM44 - 180mm ID x 600mm high access flue block

DM44 - 180mm ID x 600mm high access flue block

59-130717
£104.99 (including VAT)
Out of stock
DM44 - 180mm ID x 150mm high offset block

DM44 - 180mm ID x 150mm high offset block

59-130718
£92.99 (including VAT)
Out of stock
DM44 - 180° flue pipe entry kit (4 parts)

DM44 - 180° flue pipe entry kit (4 parts)

59-130719
£239.99 (including VAT)
Out of stock
DM44 - 180mm ID starter flue block

DM44 - 180mm ID starter flue block

59-130720
£35.99 (including VAT)
Out of stock
DM44 - 180mm ID x 440mm sq. DM support block

DM44 - 180mm ID x 440mm sq. DM support block

59-130721
£81.99 (including VAT)
Out of stock
DM44 - 45° flue pipe entry kit (4 parts)

DM44 - 45° flue pipe entry kit (4 parts)

59-130722
£239.99 (including VAT)
Out of stock
DM44 - 570mm sq. capping for render

DM44 - 570mm sq. capping for render

59-130723
£73.99 (including VAT)
Out of stock
DM44 - 820mm sq. capping for brickwork

DM44 - 820mm sq. capping for brickwork

59-130724
£108.99 (including VAT)
Out of stock
DM44 - 440mm square x 300mm high access casing

DM44 - 440mm square x 300mm high access casing

59-130725
£82.99 (including VAT)
Out of stock
DM44 - 440mm sq. x 300mm high casing & soot door

DM44 - 440mm sq. x 300mm high casing & soot door

59-130726
£234.99 (including VAT)
Out of stock
DM44 - outer casing

DM44 - outer casing

59-130727
£67.99 (including VAT)
Out of stock
DM44 - 650mm square corbel for brickwork

DM44 - 650mm square corbel for brickwork

59-130728
£151.99 (including VAT)
Out of stock
DM44 - 200mm ID x 440mm sq. DM support block

DM44 - 200mm ID x 440mm sq. DM support block

59-130730
£115.99 (including VAT)
Out of stock
Your Chimney Flue Questions Answered

What is the purpose of a chimney flue? -

A chimney flue is used to safely channel smoke, gases, and other by-products of combustion out of a building. This helps to keep the indoor environment safe and ensures efficient operation of a fireplace or stove.

How do I choose the right chimney flue size? +

What materials are your chimney flues made from? +

Can I install a chimney flue myself? +

What are the benefits of using a TWPro chimney flue? +

How do I maintain my chimney flue? +

Are your chimney flues compliant with UK regulations? +

A chimney flue is an essential part of any fireplace or stove setup, and finding the right one is crucial for both safety and efficiency. Here at National Flues, we offer a wide variety of chimney flues to meet every need, from residential homes to large commercial buildings. Our product range includes popular lines like TWPro, Sflue, and IL, all available in multiple diameters, and finishes including sleek black, versatile grey, and classic white.

Our TWPro range is especially noteworthy for its durability and ease of installation, making it a fantastic choice for both new builds and chimney renovations. Available in sizes ranging from 80mm to 200mm, TWPro flues are perfect for both small domestic stoves and larger commercial boilers. Whether you need adaptors, pipes, elbows, or terminals, our TWPro system covers all bases.

The Sflue range is ideal if you're looking for something robust and aesthetically pleasing. With sizes available in 100mm to 150mm diameters, and finishes like black, grey, and white, they seamlessly integrate into any setting. The Sflue system includes all necessary components such as adaptors, pipe bends, and support brackets, ensuring a hassle-free installation.

For gas vents, our IL range offers diameter sizes of 100mm to 150mm, ensuring safe and effective venting for gas appliances. They are designed to comply with the highest standards, featuring easy-to-install components like adjustable lengths, elbows, and terminal fittings.

We also offer comprehensive commercial flue systems with diameters up to 800mm, ensuring even the largest installations are well catered for. Our products are designed for longevity and compatibility, no matter the application or environment.
Why Buy Chimney Flue Products
Chimney flues serve a critical role in directing smoke and gases out of your home or commercial building, making them an indispensable part of any heating system. Our chimney flues are designed for a variety of uses, from wood-burning stoves and fireplaces to gas appliances and commercial boilers.

The TWPro flues are particularly versatile, ideal for both domestic and commercial applications. Whether you are fitting out a new-build home or upgrading an existing fireplace, TWPro's wide range of diameters and finishes ensures you’ll find precisely what you need.

Sflue systems are best suited for those who prioritise robustness and visual appeal. Their aesthetic design makes them perfect for modern living spaces and upscale commercial establishments.

For gas appliances, the IL range offers the best in safety and compliance, making them ideal for residential properties with gas fires or heaters. They provide reliable venting solutions that adhere to stringent safety standards.

Commercial establishments with extensive heating needs can benefit greatly from our larger diameter options, ensuring efficient ventilation even in the most demanding environments.