System 4 is a flexible liner designed for use with gas and oil fired appliances. It is designed to accomodate temperatures not exceeding 300°C.
It is available in the following diameters: 100mm, 125mm, 150mm, 180mm and 200mm.
System 4 is designed to be used only inside a chimney as a liner and should only be connected to a suitable connecting flue pipe.
System 4 is not suitable for condensing applications. Please see our System 35 flexible flue which is suitable for condensing applications.
View our System 4 brochure