What is the defining feature of a double hung window?

Prepare for the Seabee BU A‑School Building Basics Test. Boost your skills with flashcards and multiple-choice questions, with hints and explanations provided. Gear up for success on your exam!

The defining feature of a double hung window is that both sashes slide vertically. This means that both the upper and lower parts of the window can be moved up and down independently, allowing for better ventilation options and ease of cleaning. This design is highly functional, as it enables users to open either sash depending on the airflow needs, creating a versatile window style that is widely used in residential applications.

In contrast, the other options describe different window types or characteristics that do not align with the functioning of a double hung window. The operability of only one sash, as mentioned in one choice, refers to a single hung window instead. Aesthetic appeal is a general trait that may apply to many types of windows, but it does not define the operational characteristics of the double hung design. Lastly, a window that swings open like a door describes a casement or awning window, which operates on a different mechanism entirely. Understanding these distinctions helps clarify why the vertical sliding action of both sashes is what specifically characterizes a double hung window.

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