Suitable for Grant Vortex boilers up to 70kW Maximum vertical height (from top of boiler) = 19 metres Designed to enable an existing chimney to be utilised. Available in 6, 8, 10, 11, 12, 14 and 16 metre flexi packs Quick and simple to install 100mm flue pipe diameter for boilers up to 46kW 125mm flue diameter for boilers from 46-70kW Smooth bore flexible stainless steel flue liner, specifically designed for condensing boilers Single skin white powder coated extensions available in 150mm, 250mm, 450mm or 950mm fixed lengths and a 235-300mm adjustable length