A mullion divides a window into smaller, more manageable units. This was true back when large sheets of glass were impossible to manufacture, and it’s true now of large storm windows or inserts. Mullions help separate and support the glass either vertically or horizontally. For inserts, mullions can help make daily removal and cleaning easier.
How Mullions Work with Storm Windows
For those looking to get a storm windows for a larger window, glass wall, or floor to ceiling window, using mullions to divide and conquer might be the way to go. Two smaller interior storm windows are easier to handle than large storm windows.
Indow window inserts are an acrylic insert surrounded by compression tubing that press into place on the inside frame of your glass window or wall. They increase energy efficiency just like traditional storm windows, but have added benefits such as being easy to remove and blocking up to 70% of outside noise.
For Indow inserts to work with glass doors and extremely large windows, we add a mullion. It’s basically an H frame that divides the window frame into two even areas that two smaller inserts can be inserted into. The H frame will match the color of the insert (which matches your window frame) and can be adjusted to divide along a natural split.
– Joseph Casillo, Senior Project Manager, 25 Broad St. New York, New York
How are Mullions Installed?
A window insert, just like a window, can be divided in two (though sometimes more) sections with a mullion either horizontally or vertically. This means you’ll have two window inserts side by side, or one on top and one on bottom. What determines this is the size and shape of your original window or glass door. It happens most often with large window and large storm windows.
All Indow mullion kits include an H Bar to divide you window frame. Imagine sliding the inserts into the H for the top and bottom divide, then flip the H on its side for the side by side version. Standard lengths are in one foot increments up 8’ and can be shipped UPS Ground.
Custom cuts are exact lengths and available with custom fee. Specialty F bar profile is available for inside corners. Contact us for more details.
- Some extremely large windows are too large for one insert (imagine trying to install those large storm windows) – mullions divide it into sections making it possible to place inserts.
- Be able to open your window by removing one of two inserts.
- Mullions can be used with any type of insert grade and will not alter performance of the insert if installed correctly.