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MI-FLEX 125MM (5 INCH) Flue Liner - Install Kits & Accessories

Explore our premium range of MI-FLEX 125MM (5 INCH) flue liners, install kits, and accessories designed for optimal performance and durability. Whether you need a coil or cut length liner, we offer top-of-the-line 316L Mi-FLEX products to ensure your chimney system functions smoothly and safely.
Explore our premium range of MI-FLEX 125MM (5 INCH) flue liners, install kits, and accessories designed for optimal performance and durability. Whether you need a coil or cut length liner, we offer top-of-the-line 316L Mi-FLEX products to ensure your chimney system functions smoothly and safely.


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The best selling flue liner in the UK. Suitable for gas, oil, and approved solid fuels. Call our advisers on 01670 206 999 if you need any help choosing.

£1.93 £840.99
Showing 20 of 88 items
316L Mi-FLEX 125mm x 1m CUT LENGTH

316L Mi-FLEX 125mm x 1m CUT LENGTH

35Z-125-1
£14.99 (including VAT)
In stock
316L Mi-FLEX 125mm x 44m COIL

316L Mi-FLEX 125mm x 44m COIL

35Z-125-44
from £840.99 (including VAT)
In stock
Jubilee Clip and Banding Ø 200 - 800mm length

Jubilee Clip and Banding Ø 200 - 800mm length

13-JUBILEE-200
£3.99 (including VAT)
In stock
Jubilee Clip and Banding Ø 300 - 1000mm length

Jubilee Clip and Banding Ø 300 - 1000mm length

13-JUBILEE-300
£4.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor - Ø 100-Ø 125

Increasing MI-FLEX Adaptor - Ø 100-Ø 125

20-100-MR
£20.99 (including VAT)
In stock
Top Clamp - Ø 125

Top Clamp - Ø 125

20-125-C
£9.99 (including VAT)
In stock
Gather Hood (300x300) - Ø 125

Gather Hood (300x300) - Ø 125

20-125-GHM
£127.99 (including VAT)
In stock
Gather Hood Small (300x200) - Ø 125

Gather Hood Small (300x200) - Ø 125

20-125-GHS
£118.99 (including VAT)
In stock
Joiner - Ø 125

Joiner - Ø 125

20-125-J
£21.99 (including VAT)
In stock
MI-FLEX Adaptor - Ø 125

MI-FLEX Adaptor - Ø 125

20-125-MAE
£19.99 (including VAT)
In stock
MI-FLEX Adaptor 1mm - Ø 125

MI-FLEX Adaptor 1mm - Ø 125

20-125-MAE1
£30.99 (including VAT)
In stock
Long Tail MI-FLEX Adaptor - Ø 125

Long Tail MI-FLEX Adaptor - Ø 125

20-125-MAELT
£24.99 (including VAT)
In stock
Mini Pot Hanging Cowl 1mm (Natural) - Ø 125

Mini Pot Hanging Cowl 1mm (Natural) - Ø 125

20-125-MINIPH1
£124.99 (including VAT)
In stock
Mini Pot Hanging Cowl 1mm (Painted) - Ø 125

Mini Pot Hanging Cowl 1mm (Painted) - Ø 125

20-125-MINIPHT1
£132.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor - Ø 125-Ø 150

Increasing MI-FLEX Adaptor - Ø 125-Ø 150

20-125-MR
£22.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor 1mm  - Ø 125-Ø 150

Increasing MI-FLEX Adaptor 1mm - Ø 125-Ø 150

20-125-MR1
£43.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor - Ø 125-Ø 175

Increasing MI-FLEX Adaptor - Ø 125-Ø 175

20-125-MRD
£68.99 (including VAT)
In stock
Long Tail Increasing MI-FLEX Adaptor - Ø 125-Ø 150

Long Tail Increasing MI-FLEX Adaptor - Ø 125-Ø 150

20-125-MRLT
£38.99 (including VAT)
In stock
Nose Cone - Ø 125

Nose Cone - Ø 125

20-125-NC
£5.99 (including VAT)
In stock
Top Plate - Ø 125

Top Plate - Ø 125

20-125-P
£11.99 (including VAT)
In stock
Your 125MM (5 INCH) Questions Answered

What is the difference between a 125mm (5 inch) flue liner and other sizes? -

The 125mm (5 inch) flue liner is specifically designed for smaller fireplace openings and is suitable for wood-burning stoves and small appliances.

Do I need special tools to install a 125mm (5 inch) flue liner? +

Are MI-FLEX 125MM (5 INCH) flue liners compatible with all chimney systems? +

How do I maintain and clean a 125mm (5 inch) flue liner? +

Can I use a 125mm (5 inch) flue liner with a multi-fuel stove? +

Are MI-FLEX 125MM (5 INCH) flue liners compliant with building regulations? +

Do you provide installation services for MI-FLEX 125MM (5 INCH) flue liners? +

What are the benefits of using a MI-FLEX 125MM (5 INCH) flue liner over traditional options? +

When it comes to ensuring your fireplace operates efficiently, choosing the right flue liner is essential. Our 125mm (5 inch) MI-FLEX range provides superior quality flue liners made from durable 316L stainless steel. These liners are corrosion-resistant, ensuring a long lifespan for your chimney system. Additionally, our install kits, fixings, terminals, insulation, and accessories are expertly crafted to complement your flue liner installation, making maintenance hassle-free.
Why Buy 125MM (5 INCH) Products
The MI-FLEX 125MM (5 INCH) flue liners are ideal for both residential and commercial fireplace applications. These liners are suitable for various fuel types, including wood, gas, oil, and solid fuels. Whether you are constructing a new chimney or renovating an existing one, our 316L Mi-FLEX products provide the perfect solution for efficient and safe venting of combustion by-products.

Trusted By Trade Professionals

Our 125MM (5 INCH) products and services are trusted by hundreds of professionals nationwide. We're committed to providing quality and reliability that meets the high standards of our customers.

Dedicated Support

Experience our unparalleled customer service and support when you buy 125MM (5 INCH) from National Flues. Our team is here to assist you every step of the way, ensuring your needs are met with expertise and care.

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