SFL Flues & Chimneys
Pottington Business Park
EX31 1LZ

+44 (0)1271 326633 Contact us Today


+44 (0)1271 326633

British-Built Unitary Radiant Flue Systems From SFL

Flue Systems For Unitary Radiant Heaters

High-level gas-fuelled radiant tube heaters are an efficient way to provide space heating and spot occupancy heating in much taller commercial and industrial buildings. Although in an application where spot heating is specified the heaters can be installed unflued with the necessary high- and low-level ventilation, in the majority of modern installations

Unitary Radiant Tube Heaters have individual flues exiting vertically through the roof. In applications where the heaters are wall-mounted, they usually exhaust horizontally through the wall.

With the latest “black globe” radiant thermostats, the radiant tube in shot burner will have enhanced high/low or modulating control to minimise fuel consumption, this could in certain instances produce exhaust products condensation within the flue.


Important Considerations

Performance of the appliances can be significantly affected by incorrect flue design and many other factors including:

  • Flue system support
    All radiant tube heaters expand, contract and move in use and will be hung on chains, the flue system should be self-supporting and have a well-engineered joint design.
  • Flue diameters & range
    Most radiant tube flue systems are 80, 100 and 130mm dia, these diameters are set on product approval and should always be used.
  • Knowledge & safety are key
    SFL work in partnership with radiant tube manufacturers ensuring that our flue and ancillaries are perfectly matched to exhaust the products safely and efficiently.

Why choose SFL?

We are proud of our British built heritage at SFL. All our products are fabricated at our manufacturing centre in Barnstaple, Devon, UK. As well as investment in the latest manufacturing system, we also have an extensive R&D centre ensuring continuous product development and testing to the latest European standards.

UK Flag

British Built

UK manufactured flue & chimney systems.


Full Design Support

Get expert design assistance & full turnkey package support.


Industry Expertise

With over 50 years experience, you are in expert hands with SFL.

Successful project delivery, no matter the challenge.

We’re committed to offering industry-leading support services. That’s why SFL can provide full technical support throughout the whole process of design, manufacture, and supply of your upcoming project. From initial product selection from our British-built systems range to complete design and calculations. SFL work with carefully selected installation teams to ensure your turnkey package is carried out on time within budget by seasoned professionals.

Suitable Systems


Single Wall Flue System


SUPRA® is our single wall stainless steel chimney system designed with the commercial installer in mind. Pre-fitted seals make it a go-to product for any commercial condensing and positive pressure applications.

SUPRA PLUS® is our single wall stainless steel chimney for 80mm to 350mm diameter systems.

SUPRA XL® is our single wall stainless steel flue and chimney for 400 to 600mm diameter systems.

Need technical design assistance?

Let's discuss your project

Our team of experienced commercial flue experts are on hand to assist you at every stage of your project. Support includes product selection and application advice including existing system surveys and advice. Working with key installation partners we can provide you with a bespoke customised turnkey package.

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