The quickest way to identify if you have an Andersen product is by looking at the glass. Located in the lower right hand corner of the glass (usually) there is an Andersen logo. This logo contains the date the unit was manufactured and what type of glass it has. This logo is useful to determine if in fact your window / door unit is an Andersen® product, however, this does NOT give us the complete unit information such as style, type or series. Is my product an Andersen®? Look at the glass to find out.