The 316L grade flexible liner is manufactured with a unique smooth internal surface which ensures an unrestricted condensate flow back to the appliance this ensures its suitability on condensing boiler applications. This smooth internal surface also reduces the possibility of build up of soot on multi fuel installations and assists in easier sweeping of the liner. It’s manufactured from 2 layers of 0.12mm 316L grade stainless steel which offers an excellent corrosive resistance property. The product is joined  with a unique double Stapling Fastening system which ensures a reliable highly durable flexible strength. It’s marked at 1meter intervals for cutting purposes. The markings indicate the product name and designation code. A directional arrow is also printed at 1 meter intervals indicating the flue gas flow direction and the metres remaining. It is essential that the flexible liner is installed as per the directional arrow system. It’s been approved and tested to: EN1856-2 T600 N1 W V2 L50012 G (316L grade).