What Is a Twin Mulled Window?

  • James H. Sterling
  • Artisan Distilling
  • 2 min read
What Is a Twin Mulled Window?

Curious about What Is a Twin Mulled Window? Uncover accurate answers in our full report.

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Mulled windows are attached side-by-side.

The twin mulled window is two windows attached side-by-side. The triple and quad mulled windows include three and four attached windows, respectively. The traditional twin mulled window style requires installation of two windows and a mull bar. The mull bar, which is also called a mullion, is used with sealant to provide an air-tight connection between the side-by-side windows and the window frame.

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James H. Sterling

James H. Sterling

Environmental Science & Climate Journalist

James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.

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