Final answer:
In engineering, permanent/temporary wall openings less than a certain height above the floor should be protected from falling.
Step-by-step explanation:
In engineering, every permanent/temporary wall opening (including windows) that is less than a certain height above the floor should be protected from falling. The specific height requirement may vary depending on the specific regulations and standards in place. However, as a general example, let's say that any wall opening less than 18 inches above the floor (where there are 4 or more foot drop) should be protected to ensure safety.