The primary purpose of using a mullion in window design is to support the glass within the window frame.
Explanation:
Mullion Definition: A mullion is a vertical or horizontal structural element that divides adjacent window panes. It is an integral part of the window frame.
Supporting the Glass: The main function of the mullion is to provide structural support. By dividing the window into smaller sections, mullions help to hold the large panes of glass in place and provide the necessary support to maintain the strength and integrity of the window.
Other Functions:
While mullions can sometimes be used for decorative purposes or to create aesthetic designs, their primary purpose is functional support.
They do not enhance ventilation as they are part of the stationary window frame structure, nor do they block sunlight significantly compared to other window treatments only.
Conclusion: Based on the above explanations, the correct answer is: To support the glass within the window frame.
