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Get the Best 150mm (6 Inch) Flue Liners | National Flues

Looking to enhance your fireplace efficiency and safety? Our 150mm (6 inch) flue liners are the perfect solution. With MI-Flex and 904L Mi-FLEX options available, along with essential accessories like install kits, fixings, terminals, insulation, and more, you can trust National Flues to provide high-quality products for your fireplace upgrade.
Looking to enhance your fireplace efficiency and safety? Our 150mm (6 inch) flue liners are the perfect solution. With MI-Flex and 904L Mi-FLEX options available, along with essential accessories like install kits, fixings, terminals, insulation, and more, you can trust National Flues to provide high-quality products for your fireplace upgrade.


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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 £1,928.99
Showing 19 of 86 items
Rockwool Tube - 1000mm long  150mm

Rockwool Tube - 1000mm long 150mm

90-RPS-150
£41.99 (including VAT)
In stock
Aluminium Tape

Aluminium Tape

90-RPS-T
£26.99 (including VAT)
In stock
Vermiculite (100L Bag)

Vermiculite (100L Bag)

90-VERM
£34.99 (including VAT)
In stock
Debris Collar with Jubilee Connector 150mm

Debris Collar with Jubilee Connector 150mm

94-COLLAR-J-150
£15.99 (including VAT)
In stock
Register Plate (F) - 900x495, no access hole - Ø 125 & 150

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

94-REG-F
£30.99 (including VAT)
In stock
Register Plate (G) - 900x495, 2 access hole - Ø 125 & 150

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

94-REG-G
£56.99 (including VAT)
In stock
Register Plate (H) - 900x600, no access holes

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

94-REG-H
£51.99 (including VAT)
In stock
Joiner - Ø 150

Joiner - Ø 150

20-150-J
£23.99 (including VAT)
Out of stock
MI-FLEX Adaptor 1mm - Ø 150

MI-FLEX Adaptor 1mm - Ø 150

20-150-MAE1
£33.99 (including VAT)
Out of stock
Pot Hanging Cowl 1mm (Natural) - Ø 150

Pot Hanging Cowl 1mm (Natural) - Ø 150

20-150-PHCM1
£67.99 (including VAT)
Out of stock
MI-FLEX Pot Hanging Cowl (Black) - Ø 150

MI-FLEX Pot Hanging Cowl (Black) - Ø 150

20-150-PHCMB
£102.99 (including VAT)
Out of stock
MI-FLEX Pot Hanging Cowl (Buff/Cream) - Ø 150

MI-FLEX Pot Hanging Cowl (Buff/Cream) - Ø 150

20-150-PHCMC
£94.99 (including VAT)
Out of stock
Pot Hanging Cowl 1mm (Painted) - Ø 150

Pot Hanging Cowl 1mm (Painted) - Ø 150

20-150-PHCMT1
£73.99 (including VAT)
Out of stock
MI-FLEX Pot Hanging Cowl (Terracotta) Ø 400 Lid - Ø 150

MI-FLEX Pot Hanging Cowl (Terracotta) Ø 400 Lid - Ø 150

20-150-PHCMT400
£69.99 (including VAT)
Out of stock
Top Insert Sleeve with Rain Cap - Ø 150

Top Insert Sleeve with Rain Cap - Ø 150

20-150-PSRC
£32.99 (including VAT)
Out of stock
Stainless Stove Mate Plate and Gasket - Ø 150

Stainless Stove Mate Plate and Gasket - Ø 150

20-150-SM
£36.99 (including VAT)
Out of stock
MI-FLEX Square Pot Hanging Cowl (Natural) - Ø 150

MI-FLEX Square Pot Hanging Cowl (Natural) - Ø 150

20-150-SPHCM
£71.99 (including VAT)
Out of stock
MI-FLEX Square Pot Hanging Cowl (Terracotta) - Ø 150

MI-FLEX Square Pot Hanging Cowl (Terracotta) - Ø 150

20-150-SPHCMT
£75.99 (including VAT)
Out of stock
MI-FLEX Pot Hanger Support Clamp - Ø 150

MI-FLEX Pot Hanger Support Clamp - Ø 150

20-150-SUPCL
£10.99 (including VAT)
Out of stock
Your 150MM (6 INCH) Questions Answered

What are the benefits of using a 150mm (6 inch) flue liner? -

A 150mm (6 inch) flue liner improves the draft efficiency of your fireplace, reduces the risk of chimney fires by containing flue gases, and enhances overall safety.

Are 904L Mi-FLEX flue liners suitable for all types of fireplaces? +

Do I need additional accessories with my 150mm (6 inch) flue liner? +

Can I install a 150mm (6 inch) flue liner by myself? +

How long does a 150mm (6 inch) flue liner last? +

Are 150mm (6 inch) flue liners environmentally friendly? +

Do I need to clean my 150mm (6 inch) flue liner regularly? +

When it comes to upgrading your fireplace, choosing the right flue liner is crucial. At National Flues, we offer a range of top-notch 150mm (6 inch) flue liners designed to improve the performance and safety of your fireplace. Our MI-Flex and 904L Mi-FLEX options provide durability and flexibility for easy installation. Pair them with our install kits, fixings, and insulation for a complete fireplace upgrade. Whether you need a 1m cut length or a 40m coil, we have you covered with high-quality products that meet industry standards.
Why Buy 150MM (6 INCH) Products
Our 150mm (6 inch) flue liners are ideal for both residential and commercial fireplace installations. These liners help to efficiently vent smoke and gases out of your property, reducing the risk of chimney fires and improving indoor air quality. By choosing National Flues products, you invest in a safer and more efficient fireplace system that enhances the overall comfort of your space.

Trusted By Trade Professionals

Our 150MM (6 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 150MM (6 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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