Which surfaces are no longer considered M/I on a fully contained window?

In the context of lead inspection and risk assessment, a fully contained window is designed to prevent the escape of lead-based paint debris and dust, thereby eliminating potential lead exposure risks associated with certain window surfaces. The term M/I (Maintained in Intact condition) refers to surfaces that are intact and not subject to lead hazards.

The surfaces mentioned in the correct response, which include both the sills, the header stop, and the interior stops, are considered components of a fully contained window that mitigate the risk of lead exposure. When these surfaces are properly maintained, ensuring that they do not deteriorate, they can be classified as safe and no longer M/I. This is because their integrity helps to contain any leaded materials within the window assembly.

In contrast to this, the other choices specify fewer components, which may still be considered M/I if they have not been fully addressed or maintained as part of the comprehensive window structure. For instance, the exterior sill and individual interior stops may still pose lead exposure risks if not properly managed. Understanding the role of these different components in the window assembly is crucial for assessing lead risk effectively and ensuring the safety of the environment.