What term refers to the dimensions of the glass that are visible and covered?

The term that refers to the dimensions of the glass that are visible and covered is "sash dimensions." Sash dimensions take into account both the visible area of the glass, which is the portion seen from the outside, and the portion that is covered by the frame of the window or door. This concept is essential in the construction and installation of windows, as it helps determine how much glass is actually exposed for viewing and how much is obscured by the framing materials. Understanding sash dimensions is crucial for ensuring proper measurement, aesthetics, and functionality of the window installation.