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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)
Rockwool Tube - 1000mm long  200mm
SKU: 90-RPS-200

Rockwool Tube - 1000mm long 200mm

£47.99 incl VAT

Aluminium Tape
SKU: 90-RPS-T

Aluminium Tape

£26.49 incl VAT

Vermiculite (100L Bag)
SKU: 90-VERM

Vermiculite (100L Bag)

£33.99 incl VAT

Debris Collar with Nut and Bolt - Ø 175
SKU: 94-COLLAR-175

Debris Collar with Nut and Bolt - Ø 175

£23.99 incl VAT

Debris Collar with Nut and Bolt - Ø 200
SKU: 94-COLLAR-200

Debris Collar with Nut and Bolt - Ø 200

£25.99 incl VAT

Debris Collar with Jubilee Connector - Ø 125
SKU: 94-COLLAR-J-125

Debris Collar with Jubilee Connector - Ø 125

£13.99 incl VAT

Register Plate (F) - 900x495, no access hole - Ø 125 & 150
SKU: 94-REG-F

Register Plate (F) - 900x495, no access hole - Ø 125 & 150

£29.99 incl VAT

Register Plate (G) - 900x495, 2 access hole - Ø 125 & 150
SKU: 94-REG-G

Register Plate (G) - 900x495, 2 access hole - Ø 125 & 150

£54.49 incl VAT

Register Plate (H) - 900x600, no access holes
SKU: 94-REG-H

Register Plate (H) - 900x600, no access holes

£49.99 incl VAT

Register Plate (J) - 900x600, no access hole - Ø 175 & 200
SKU: 94-REG-J

Register Plate (J) - 900x600, no access hole - Ø 175 & 200

£42.99 incl VAT

Register Plate (K) - 900x600, no access hole - Ø 175 & 200
SKU: 94-REG-K

Register Plate (K) - 900x600, no access hole - Ø 175 & 200

£47.99 incl VAT

Herald 6 LPG Gas Stove with Double Doors
SKU: GTBHH6LR2

Herald 6 LPG Gas Stove with Double Doors

£1,398.99 incl VAT

10m flex pack bundle (Special Offer)
SKU: SO-T1

10m flex pack bundle (Special Offer)

£298.99 incl VAT

Pot Hanging Cowl 1mm (Natural) - Ø 125
SKU: 20-125-PHCM1

Pot Hanging Cowl 1mm (Natural) - Ø 125

OUT OF STOCK

£65.49 incl VAT

PH Cowl - Ø 125
SKU: 20-125-PHCMB

PH Cowl - Ø 125

OUT OF STOCK

£64.49 incl VAT

PH Cowl - Buff / Straps / Mesh x 125mm - Ø 125
SKU: 20-125-PHCMC

PH Cowl - Buff / Straps / Mesh x 125mm - Ø 125

OUT OF STOCK

£70.49 incl VAT

Pot Hanging Cowl 1mm (Painted) - Ø 125
SKU: 20-125-PHCMT1

Pot Hanging Cowl 1mm (Painted) - Ø 125

OUT OF STOCK

£70.99 incl VAT

MI-FLEX Pot Hanging Cowl (Terracotta) Ø 400 Lid - Ø 125
SKU: 20-125-PHCMT400

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

OUT OF STOCK

£67.49 incl VAT

MI-FLEX Pot Hanger Support Clamp - Ø 125
SKU: 20-125-SUPCL

MI-FLEX Pot Hanger Support Clamp - Ø 125

OUT OF STOCK

£10.49 incl VAT

Increasing MI-FLEX Adaptor - Ø 150-Ø 200
SKU: 20-150-MRD

Increasing MI-FLEX Adaptor - Ø 150-Ø 200

OUT OF STOCK

£70.99 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.