_____ clearance is required from windows that do not open.

The choice indicating that no clearance is required from windows that do not open is correct because these types of windows pose less risk in terms of safety and ventilation compared to operable windows. Non-opening windows do not present a means of egress in the event of an emergency, which eliminates the need for maintaining specific spacing requirements that are often necessary for windows that can be opened.

In building codes, clearance requirements are often tied to the potential use of a window as a means of escape or to ensure adequate airflow and light. Since non-opening windows do not fulfill those functions, they are exempt from these clearance regulations. This allows for more flexibility in design and layout, as there are fewer restrictions associated with the placement of furniture or other objects near these windows.

Clearance requirements typically apply to windows that can be opened to facilitate emergency exits and ventilation; therefore, non-opening ones do not necessitate adherence to the same standards.