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IL Gas

Il Gas Vented Flue System

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4" 100mm

IL Gas Flue

IL Gas Vent
5" 125mm

IL Gas Flue

Stainless Steel Twin Wall
6" 150mm

IL Gas Flue

Black Twin Wall

IL Gas - Twin Wall Insulated Vent

This system is a twin wall air gap pre-fabricated domestic gas vent that has been used in the UK for over 25 years, having built a reputation for quality and reliability. The IL gas vent is designed for naturally aspirated domestic gas fired appliances with a draught hood / diverter and where the chimney is required to operate under negative pressure and dry conditions and the flue gas temperatures will not exceed 250°C.


The IL gas vent is suitable for gas appliances, typically in domestic or small commercial installations, with draught-hoods or with a flue gas temperature not exceeding 250°C and zero or negative pressure in the flue.


Available in three diameter sizes covering 100mm, 125mm and 150mm, the product consists of an aluminium liner and a zalutite outer case, separated by a 6mm air gap. This product is suitable for internal and external applications, but not suitable for condensing and positive pressure applications.

Quality Assured

The IL product is manufactured and certified to BS EN 1856-1 and tested to BS EN 1859 to the performance designations as defined in Table A. Products unless otherwise stated are CE certified under our FPC Certificate 0086-CPD-496040.

All components are manufactured under a Quality Assurance Scheme, certificate No. FM557622, administered by British Standards in accordance with BS EN 9001:2008. In addition, SFL operates a CE approved Factory Production Control System as required under the Constructions Products Directive 93/68/EEC..



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