Tecnoflex Plus is a twin skin flexible flue liner designed for gas, oil and multi fuel, where the maximum flue gas temperature does not exceed 600°C. Ideal for use on open fires or closed stoves/appliances. This product is the market leader in its field for strength and performance. Flexible flue liner is available in both 316L stainless steel and 904L. Both liners are suitable to reline your chimney for use with multi-fuel stoves and wood burners and are HETAS approved.