To determine how aggressive the impact of an environment is on a window, door, or hardware, the environment itself, the intensity of use, and the location must be considered. If necessary, metal components can be treated with a coating.

Coastal areas with salt and sand in the air, industrial zones, swimming pools with chlorine vapors, and places where strong cleaning agents are used, for example, require such a coating. The coating of the doors and windows is specifically tailored to the conditions.