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Exterior Steel Frame Glass Door Construction

Glass Divided Lites

The lites on a door refer to the piece of glass that is framed and separated by lines that form divisions, also called mullions. The divisions of the lites can be true divided or simulated divided.

True Divided Lites(TDL): The glass on the door is multiple pieces instead of one single pane. These pieces are separated by larger mullions going through them.

Simulated Divided Lites (SDL): Simulating divided glass, this is a large, single pane of glass with the mullions laid on top.

True Divided Lites - TDL

True Divided Lites
  • Easily replaceable due to the separation of all of the pieces. Offers easy cleaning and replacement.
  • Due to mullions stabilizing the glass, this construction is stronger
  • Mullion width: 1-5.8"

Simulated Divided Lites - SDL

Simulated Divided Lites
  • Most budget friendly
  • Provides design similar to true divided
  • Allows for mullions as small as 3/4"

Exterior Steel Door Profiles

Flat-to-Flat TDL

TDL Flat-to-Flat

Flat-to-Angled-Shape TDL

TDL Flat-to-Angled-Shape

Flat-to-T-Shape TDL

TDL Flat-to-T-Shape

Flat-to-Flat SDL

SDL Flat-to-Flat

Flat-to-Triangle SDL

SDL Flat-to-Triangle

Flat-to-T-Shape SDL

SDL Flat-to-T-Shape




We use Door Hardware with Euro Multipoint

  • Steel exterior doors are always equipped with a European Multipoint System
  • Utilizing a high-end GU system
  • From the center of the keyhole to the lever hole is a standard distance of 3-5

Multipoint Mechanism

Latch: Left hand or right hand reversible

Follower: The receiving end for the spindle of the lever. It recieves with no play and offers reliable locking.

Deadbolt: 2-turn or 1-turn options that both offer a 20 mm throw.

Cylinder Hole: Can accommodate a 22 mm profile or round cylinder.

Exterior Steel Door Corner Sample

FerroFinestra W75 TB

with slim lines to offer superior thermal performance. Due to the depth of the profile on our steel and glass doors, we can utilize insulated glazing up to 52 mm that is highly energy efficient on these doors as well. Due to the additions of insulated glazing and thermal protection on our steel and glass exterior models, these doors are a great option for even the harshest of climates

Exterior Steel Door Corner Sample

FerroFinestra W50 TB

The FerroFinestra W50 TB system from Ottostumm offers a thermal barrier that allows this door to still have the same design effects as the original steel door designs from the 20th century. By using the high-density synthetic polymer combined with our 37mm low-E glass, these doors can meet current regulations while providing comfort and a flawless design. Available in a variety of different finishes and completely customizable to fit your needs.

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