This article helps identify Andersen® windows and patio door glass types and includes example images of possible glass codes.

First, locate the Andersen glass logo to determine the type of glass in an Andersen window or patio door.

Locate Andersen® Glass Logo

The Andersen glass logo is etched into the glass surface and is usually found in the bottom corner. To make the glass etching easier to read, try using the following helpful hints:

A magnifying glass.

Take a digital picture and enlarge the image.

A flashlight to illuminate the characters.

A plain, dark piece of paper behind the etching can help block out glare.

Identify Glass Type

Around the Andersen glass logo will be a series of letters and numbers indicating the glass type. This notation varies based on the selected glass type and may include, but is not limited to, HP Low-E, High-Performance (HP), HP Sun, HP Smart Sun, Dual-Pane Clear, etc. The Andersen glass logo does not always specify the specialty glass in the window or patio door. Tinted or patterned glass types will not be marked.

Additional logo examples can be seen in Glass Types .

Glass Code

Tempering Code

Depending on the window or patio door type, the unit may have a tempering code etched into the glass surface. The tempering code does not identify the glass type. Please locate the Andersen® glass logo to determine the glass type.

Tempered Glass Code

FX-Number

From 2002 - Present, we have etched the glass used on Flexiframe®, Arch and Springline™ units. Monolithic Impact Resistant Glass does not have an FX-Number etched on it. 

For units manufactured prior to 2002, the FX-Number may be written under the sill stop or on the glass label, see Identify Your Andersen® Window or Patio Door Using a Product ID Label for more information.  

FX-Number Example on Sill Stop

FX Order Number Example

Contact Andersen® Windows and Doors if unsure about the glass type or where to find the Andersen® glass logo.

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