IL comprises straight pipe lengths and associated fittings and accessories, twin-wall construction with an aluminium liner, 6mm air cavity protected by an outer casting of Zalutite. Components easily lock together providing a strong rigid system. Three diameters, 100mm, 125mm and 150mm. Suitable for gas appliances, typically in domestic or small commercial application. The appliance must always be draught-hooded, the gas temperature must not exceed 250°C, and there must be a zero or negative pressure at the flue outlet. Manufactured, tested and Kitemarked to BS 715 1993. The IL gas vent is suitable for short external runs which do not exceed 3 metres. If exceeding 3 metres, ILS can be used externally and is totally interchangeable with the IL gas vent.
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