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316L Mi-FLEX Flue Liner | Durable & Versatile Flue System - National Flues

Looking for a durable and versatile flue system? Explore our 316L Mi-FLEX range, designed to meet all your fireplace installation requirements. Crafted from high-quality stainless steel, our flue liners ensure optimal safety and performance. Whether you need a 3-inch or a 12-inch liner, we have you covered. With a comprehensive selection of fixings, terminals, insulation, and accessories, you can trust in our products for a seamless installation process.

 

MI-FlexMI-Flex
Chimney FlueChimney Flue
Connecting PipesConnecting Pipes
Fans Flashings CowlsFans Flashings Cowls
Installation PartsInstallation Parts
After Care PartsAfter Care Parts
StovesStoves
FireplacesFireplaces
80MM (3 INCH)
80MM (3 INCH)
100MM (4 INCH)
100MM (4 INCH)
125MM (5 INCH)
125MM (5 INCH)
150MM (6 INCH)
150MM (6 INCH)
175MM (7 INCH)
175MM (7 INCH)
200MM (8 INCH)
200MM (8 INCH)
250MM (10 INCH)
250MM (10 INCH)
300MM (12 INCH)
300MM (12 INCH)
Top Insert Sleeve - Ø 125
SKU: 20-125-PS

Top Insert Sleeve - Ø 125

£11.49 incl VAT

Top Insert Sleeve with Rain Cap - Ø 125
SKU: 20-125-PSRC

Top Insert Sleeve with Rain Cap - Ø 125

£30.49 incl VAT

Rain Cap - Ø 125
SKU: 20-125-RC

Rain Cap - Ø 125

£25.49 incl VAT

Register Plate Adaptor - Ø 125
SKU: 20-125-RPA

Register Plate Adaptor - Ø 125

£49.99 incl VAT

Increasing Register Plate Adaptor - Ø 125-Ø 150
SKU: 20-125-RPAI

Increasing Register Plate Adaptor - Ø 125-Ø 150

£68.99 incl VAT

MI-FLEX Square Pot Hanging Cowl (Natural) - Ø 125
SKU: 20-125-SPHCM

MI-FLEX Square Pot Hanging Cowl (Natural) - Ø 125

£68.99 incl VAT

MI-FLEX Square Pot Hanging Cowl (Terracotta) - Ø 125
SKU: 20-125-SPHCMT

MI-FLEX Square Pot Hanging Cowl (Terracotta) - Ø 125

£73.49 incl VAT

Top Hat Adaptor - Ø 125
SKU: 20-125-THA

Top Hat Adaptor - Ø 125

£56.99 incl VAT

Register Plate Adaptor - Ø 150
SKU: 20-125-THAR

Register Plate Adaptor - Ø 150

£85.49 incl VAT

Top Clamp - Ø 150
SKU: 20-150-C

Top Clamp - Ø 150

£10.49 incl VAT

Gather Hood (300x300) - Ø 150
SKU: 20-150-GHM

Gather Hood (300x300) - Ø 150

£124.99 incl VAT

Gather Hood (300X200) - Ø 150
SKU: 20-150-GHS

Gather Hood (300X200) - Ø 150

£114.99 incl VAT

Joiner - Ø 150
SKU: 20-150-J

Joiner - Ø 150

£23.49 incl VAT

MI-FLEX Adaptor - Ø 150
SKU: 20-150-MAE

MI-FLEX Adaptor - Ø 150

£18.99 incl VAT

MI-FLEX Adaptor 1mm - Ø 150
SKU: 20-150-MAE1

MI-FLEX Adaptor 1mm - Ø 150

£32.49 incl VAT

Flue Adaptor - Long Tail - Ø 150
SKU: 20-150-MAELT

Flue Adaptor - Long Tail - Ø 150

£27.49 incl VAT

Mini Pot Hanging Cowl 1mm (Natural) - Ø 150
SKU: 20-150-MINIPH1

Mini Pot Hanging Cowl 1mm (Natural) - Ø 150

£119.99 incl VAT

Mini Pot Hanging Cowl 1mm (Painted) - Ø 150
SKU: 20-150-MINIPHT1

Mini Pot Hanging Cowl 1mm (Painted) - Ø 150

£127.49 incl VAT

Increasing MI-FLEX Adaptor - Ø 150-Ø 175
SKU: 20-150-MR

Increasing MI-FLEX Adaptor - Ø 150-Ø 175

£28.99 incl VAT

Long Tail Increasing MI-FLEX Adaptor - Ø 150-Ø 175
SKU: 20-150-MRLT

Long Tail Increasing MI-FLEX Adaptor - Ø 150-Ø 175

£45.99 incl VAT

Your Questions Answered

What is the difference between 316L Mi-FLEX and other flue liners? -

316L Mi-FLEX stands out due to its high-grade stainless steel construction, which enhances durability and corrosion resistance. Its flexibility and smooth inner surface make it suitable for various fireplace applications.

Can I use 316L Mi-FLEX for both wood burners and gas appliances? +

How do I know what size of 316L Mi-FLEX liner I need? +

Do I need professional help to install 316L Mi-FLEX liners? +

Is insulation necessary when using 316L Mi-FLEX liners? +

Can I use 316L Mi-FLEX liners in listed buildings? +

How long can I expect a 316L Mi-FLEX liner to last? +

At National Flues, we take pride in offering top-tier flue solutions for domestic and commercial applications. Our 316L Mi-FLEX flue liners are renowned for their durability, flexibility, and corrosion resistance, making them ideal for a wide range of projects. Whether you're a professional installer or a DIY enthusiast, our cut lengths and coils provide flexibility in fitting various flue sizes. Trust in the quality of our products to ensure a safe and efficient fireplace setup.
Why Buy These Products
The 316L Mi-FLEX flue liners are designed to cater to diverse applications, including wood burners, multi-fuel stoves, gas appliances, and more. With their high-temperature resistance and smooth inner surface, these liners promote optimal airflow and protect your chimney structure from heat and corrosion. Whether you're renovating an existing chimney or installing a new flue system, our Mi-FLEX range offers reliability and performance. Enjoy peace of mind knowing that your fireplace system is well-equipped to handle intense heat and emissions.

Trusted By Trade Professionals

Our 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. Our team is here to assist you every step of the way, ensuring your needs are met with expertise and care.