Question:

What is the primary purpose of using a `mullion' in window design?

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Mullion = vertical support between window panes; Transom = horizontal support between window panes.

Updated On: Feb 9, 2026

For decoration
To enhance ventilation
To support the glass within the window frame
To block sunlight

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The Correct Option is C

Solution and Explanation

Concept: A mullion is a vertical structural element that divides adjacent window units and provides support to the glazing system. Explanation:
The primary function of a mullion is structural support, especially in large window openings.
It helps transfer the load of the glass and frame safely to the building structure.
Mullions also allow windows to be divided into smaller panes, improving strength and stability.
Decoration may be a secondary visual effect, but it is not the main purpose.
Ventilation and sunlight control are handled by operable sashes, louvers, or shading devices—not mullions. Therefore, the main purpose of a mullion is to support the glass within the window frame.
Final Answer: \(\boxed{\text{To support the glass within the window frame}}\)

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