Product Details

Our 4" Adjustable Length Twin Wall flue sections offer flexibility and precision for your flue system, making them perfect for use with pellet and biomass stoves, as well as gas/oil appliances like gas coal-effect fires and oil boilers. Available in two adjustable sizes (400mm-560mm and 560mm-920mm), these lengths provide versatility for installations where exact dimensions are required.

Each flue section is crafted with a 304 Stainless Steel outer layer and a 316 Stainless Steel inner layer, fully welded for superior durability. CE approved and HETAS certified, these products meet the highest safety and performance standards and are backed by a 25-year warranty.

Installation Guide: Our twin wall system is designed with an easy push-fit joint system, allowing for straightforward installation. Simply align and push the sections together for a secure connection. All measurements are based on the internal diameter of the system, ensuring a precise and accurate fit.

Delivery Information

Area	Delivery	Order Value	Price (ex VAT)
UK Mainland	Next Day*	Below £150 Net	£15.00
UK Mainland	Next Day*	Over £150 Net	Free
Scottish Mainland	1-2 Days	Below £150 Net	£15.00
Scottish Mainland	1-2 Days	Over £150 Net	Free

*Orders must be placed by 2pm for next-day delivery. Deliveries are made Monday to Friday during regular working hours. Orders placed on weekends, public holidays, or bank holidays will be dispatched the next working day.

Pallet Delivery

Some items incur a £50.00 (ex Vat) pallet delivery charge due to their weight and size. This will be calculated at checkout. Also listed below.

Product	Incuring Limit	Delivery
All Stoves	All Stoves	2-4 days
4" & 5" Flue Liner	16 metres & Over	48 hours
6" Flue Liner	13 metres & Over	48 hours
7" & 8" Flue Liner	2 metres & Over	48 hours
Vermiculite	10 bags or more	48 hours
Garden Stove	Per item	48 hours

All Pallet deliveries are curbside only. Some orders, especially those containing stoves, may arrive in multiple deliveries due to different suppliers, stock availability, and logistics.

For more information, please visit our Delivery Information page.

Product Specification

Material: Stainless Steel
Construction: 316 L 0.40mm Thick Stainless Steel Inner, 304 0.40mm Thick Stainless Steel Outer, Powder Coated Matt Black
Warranty: 25 Years
Designation: EN1856-1 T450 N1 D V3- L50040 G60, EN1856-1 T600 N1 D VM- L20040 G70
Internal Diameter: 100mm
External Diameter: 150mm
Fuels: Wood, Oil, Gas, Low Sulphur Coal
Special Notice: Please be advised that all our Twin Wall products are only compatible with Jeremias Twin Wall Flue System and cannot be used with any other Brand of twin wall insulated flue.

Returns

At Flue Finder, customer satisfaction is our priority. You can return unused items within 14 days of receipt, except for Stoves and cut-to-length Flue Liners (including liner kits).

If your goods are missing, defective, damaged or not as described please contact info@fluefinder.co.uk.

To initiate a return, please email us at returns@fluefinder.co.uk. We will send you a returns form and the return address.

Important: Returns must be reported in advance.

For more detailed information on the returns process and conditions, please visit our Returns Page.

*Stoves are non-returnable*

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What Our Customers Say

We value our customers' feedback and are proud to share their experiences with FLUE FINDER. Here’s what some of them have to say:

Alex T

Just placed my first order on the new site and I’m impressed. Everything was easy to find, and the whole process from browsing to checkout was seamless. Looking forward to receiving my order!
Julie

The new website is fantastic, much faster and more user friendly. Found exactly what I needed and got my confirmation email instantly. Great job!
Martin

Love the layout of the new site. Everything is clearly explained, especially the technical details. Makes ordering the right parts so much easier.