Stainless Steel flue lining
Stainless Steel Flexiflue liners – Installation of a stainless steel chimney flue liner is a practical solution for when the original clay tile liner was either never installed such as older chimneys. If the current chimney lining has cracks and crumbles and deteriorates. Flexible stainless steel liners come in different grades many sizes and bores. The bore will be sized by our chimney Engineer and the chosen lining must account chimney opening and chimney stack height but other factors also have a baring such as dimensions of room, stove fuel use etc.
Grades of stainless steel liners.
– 904 grade flue liners & 316 grade flue liners
Stainless steel is graded using a numbering system which identifies the proportions of its constituent contents (nickel and chrome) . The two principle grades used are 316 & 904 grade, the 904 being the more expensive flexible flue liner cost (often twice as much as the 316 grade) but also much more resistant to corrosion.
The 904 flexible flue liner is also often the flexible flue liner for multi fuel stoves (manufacture’s specifications).
The main difference between open fires and wood burning stoves is flue gas temperature. An open fire has a very high flue gas temperature, while a stove, which is more efficient has a low flue gas temperature. This low temperature is more likely to result in condensation of the flue gases against the side of the liner (sulphuric acid condenses at 150°C). This condensation is a big problem as acid attack is accelerated massively in the presence of water (which is one of the by-products of combustion).
Many chimney companies and our competitors will argue that 316 grade is more that adequate for your property, and in a percentage of cases this is essentially true however we feel this can compromise on safety and we strongly recommend 904 grade chimney flue liners.