"Suburban recently installed new windows and doors in our home. The work was done in a timely fashion, leaving no mess behind. They even re-hung our blinds and drapes. Their service before and after t... » more
- Steve and Chris Flowers of Moline, Illinois


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Mull

A short term for mullion. Used occasionally as a verb to describe the joining of two door or window units together, or the joining of a door to a sidelite unit.

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