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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.
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.


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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 £1,398.99
Showing 20 of 298 items
Pack 505 - (125mm, P/C/N/CNP/20-100-MR/RC)

Pack 505 - (125mm, P/C/N/CNP/20-100-MR/RC)

20-125-P505
£66.99 (including VAT)
In stock
Pack 506 - (125mm, PHCM/N/CNP/20-100-MR)

Pack 506 - (125mm, PHCM/N/CNP/20-100-MR)

20-125-P506
£78.99 (including VAT)
In stock
Pack 507 - (125mm, PHCMT/N/CNP/MAE)

Pack 507 - (125mm, PHCMT/N/CNP/MAE)

20-125-P507
£80.99 (including VAT)
In stock
Pack 508 - (125mm, PHCMT/N/CNP/20-100-MR)

Pack 508 - (125mm, PHCMT/N/CNP/20-100-MR)

20-125-P508
£84.99 (including VAT)
In stock
Pot Hanger with AD Cowl - Ø 125

Pot Hanger with AD Cowl - Ø 125

20-125-PHAD
£101.99 (including VAT)
In stock
Pot Hanger with AD Cowl (Terracotta) - Ø 125

Pot Hanger with AD Cowl (Terracotta) - Ø 125

20-125-PHADT
£101.99 (including VAT)
In stock
MI-FLEX Pot Hanging Cowl (Natural) - Ø 125

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

20-125-PHCM
£59.99 (including VAT)
In stock
MI-FLEX Support Pot Hanging Cowl (Natural) - Ø 125

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

20-125-PHCM-S
£73.99 (including VAT)
In stock
Pot Hanging Cowl 1mm (Natural) - Ø 125

Pot Hanging Cowl 1mm (Natural) - Ø 125

20-125-PHCM1
£67.99 (including VAT)
In stock
MI-FLEX Pot Hanging Cowl (Terracotta) - Ø 125

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

20-125-PHCMT
£59.99 (including VAT)
In stock
MI-FLEX Support Pot Hanging Cowl (Terracotta) - Ø 125

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

20-125-PHCMT-S
£76.99 (including VAT)
In stock
Pot Hanging Cowl 1mm (Painted) - Ø 125

Pot Hanging Cowl 1mm (Painted) - Ø 125

20-125-PHCMT1
£73.99 (including VAT)
In stock
MI-FLEX Pot Hanging Cowl (Terracotta) Ø 400 Lid - Ø 125

MI-FLEX Pot Hanging Cowl (Terracotta) Ø 400 Lid - Ø 125

20-125-PHCMT400
£69.99 (including VAT)
In stock
Pot Hanger - Ø 125

Pot Hanger - Ø 125

20-125-PHS
£22.99 (including VAT)
In stock
Top Insert Sleeve - Ø 125

Top Insert Sleeve - Ø 125

20-125-PS
£11.99 (including VAT)
In stock
Top Insert Sleeve with Rain Cap - Ø 125

Top Insert Sleeve with Rain Cap - Ø 125

20-125-PSRC
£31.99 (including VAT)
In stock
Rain Cap - Ø 125

Rain Cap - Ø 125

20-125-RC
£25.99 (including VAT)
In stock
Register Plate Adaptor - Ø 125

Register Plate Adaptor - Ø 125

20-125-RPA
£51.99 (including VAT)
In stock
Increasing Register Plate Adaptor - Ø 125-Ø 150

Increasing Register Plate Adaptor - Ø 125-Ø 150

20-125-RPAI
£71.99 (including VAT)
In stock
MI-FLEX Pot Hanger Support Clamp - Ø 125

MI-FLEX Pot Hanger Support Clamp - Ø 125

20-125-SUPCL
£10.99 (including VAT)
In stock
Your 316L Mi-FLEX 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 316L Mi-FLEX 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 316L Mi-FLEX 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 316L Mi-FLEX from National Flues. Our team is here to assist you every step of the way, ensuring your needs are met with expertise and care.