It is also recommended to install this type of pipes outside the rooms, which allows reducing the appearance of condensate on its inner surface.
The stainless steel pipe, created by the type of “sandwich” has a longer deadlines and its longer operation of. The main material for such pipes is stainless steel, such as AISI 304 (321), which contains nickel from 17% and 8% chromium and AISI 309, which contains 20% and 25% chromium and nickel.