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GS-13 Windows

The Green Seal Standard for Windows, GS-13, establishes environmental requirements for residential fenestration products including windows, skylights, glazed exterior doors, and storm doors.

The standard includes product performance requirements and environmental and health requirements such as energy efficiency, reduced toxicity, and reduced packaging. The standard serves as a tool for companies seeking to design better products. The standard is the basis for Green Seal certification.

View the standard here:

**Important Announcement** 

Green Seal is preparing to update our Windows Standard, GS-13, in mid-2018.

We are presently seeking feedback on this standard and this product category at  

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