System 4

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