What does ANSI 297.1 on glass mean?

Tuesday, July 17, 2018

It is the number of the ANSI (American National Standards Institute) standard for safety glass. Since it is updated every few years, the standard number is usually followed by the year of the revision that it meets, which also means that the glass was manufactured with a few years of that year. 

    To learn about the different types of safety glass and the meaning of the other letters and numbers around the ANSI standard number, go to our blog post How can I tell if a window or glass door is safety glass? 

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  To learn more about doors and windows, see these other blog posts:

What causes sweating (condensation) on the inside of windows in the winter? 

Is every exterior door of a house required to have a landing outside? 

 What are the small slots at the bottom of the outside of my window? 

Why does condensation form on the outside of some windows and not others in the morning? 

Why is the garage door track a white tube? 

What is the raised metal plate on the floor under the garage door?

 Why do I have to hold down the button to close the garage door?  

What are the code requirements for safety tempered glass for doors?• 

Should a front door swing in or out? 


How many exit doors are required for a house?

 How many exit doors are required for a mobile/manufactured home? 

Are openable windows required to have window screens? Will windows with no screens pass a home inspection? 

Can a bedroom door open into the garage?

What are the building code requirements for a door from the garage to the house?

What is "low-E" window glass? 

Why is a double cylinder deadbolt lock on an exterior door a safety hazard? 

How can I check my garage door to make sure it is safe?  

What is an egress window?

Does a home inspector test all the windows and doors in a home? 

How difficult is it to change a window to french doors or a sliding glass door?

How do you determine if a door is left-handed or right-handed?

Why are window security bars dangerous? 

What are the common problems you find inspecting windows?

What is causing a foggy haze on my windows? 

What do those numbers on the manufacturer's stickers in new windows mean?

What does a home inspector check on an electric garage door? 

• What is the tempered label on glass at windows and sliding glass doors called?

Why is pressure washing double pane windows an expensive mistake? 

• Do I need to have two exterior exit doors in my house? 

• When is safety glass required for windows at stairs and stair landings?

   Visit our DOORS AND WINDOWS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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