Flue Supplies

Ultraflex (316L & 904L)

App. Type: Double Skin Flexible Chimney Relining Systems
Certificate Ref: E-C057-2022
Std. Tested to: BS EN 1856-2 2009 & BS EN 1443:2003
Flue Sizes: 100mm to 400mm
Manufacturer Address: Units 6 & 7 Bellingham Way, Larkfield, Ayelsford, Kent, ME20 7HD
Manufacturer Email: [email protected]
Telephone Number: 0844 800 6586


HETAS has audited and verified that all applicable clauses in the test report have been passed in respect of the materials, design, and construction in accordance with the relevant BS EN type test standard for the appropriate technology, performance criteria of which is below;

Temperature Level T600
Pressure Level P1
Condensate Resistance W
Corrosion Resistance Vm
Flue Liner Material Specification L50012
Sootfire Resistance (G:yes or O:no) and distance to combustible material (in mm) G


The product certified has been assessed for its suitability for installation in domestic properties against the requirements of the Building Regulations and appropriate standards. The performance of the appliance has been verified as meeting the following technical performance attributes;

Combustible Clearances - mm

*HETAS product approval is not valid for appliances fitted with an external air supply ducted directly to the appliance. The installer should reference HETAS technical note TN_0020 General Guidance for the Installation, Risk Assessment & Commissioning of Solid Fuel Appliances with a Dedicated External Air Supply for more information.

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HETAS, Severn House, Unit 5 Newtown Trading Estate, Green Lane, Tewkesbury, GL20 8HD