The top, side jambs, and the sill make up what is often called the main frame of the window. This is the part of the framework that is attached to your home and holds the glass panels or sash.

The combination of rafters and columns that support the secondary framing members and transfer loads directly to the foundation.

The head, sill and jambs sections of a window.

or "Master Frame" - the jambs head and sill members of a window make up the main frame, these are commonly the heavier and therefore more expensive components in a window.

An assemblage of rafters and columns that support the secondary framing members and transfer loads directly to the foundation.