As long as the recommended cleaning process is followed, the stainless brass PVD long-life finish offers a 25 year finish guarantee, which renders the surface impervious to damage in normal use including oxidation and abrasion. So your product will stay as good as new, even in coastal areas. For standard internal residential doors a pair of hinges is adequate,  however fitting 3 hinges per door has its advantages. It will look aesthetically pleasing and from a practical viewpoint it helps spread the load evenly and will help to overcome twisting or warping. This can sometimes happen to doors over a period of time where heat and moisture are a factor.

One pack of self-adhesive intumescent hinge liners suitable for both FD30 and FD60 applications, unless otherwise stated. Successfully included within BS EN 1634-1:2014