Window and Door Performance ratings are hard to understand. Attached is a presentation by Marvin Windows and Doors discussing some of the performance ratings that windows and doors are tested to. Visit the Slideshare site for more information on the author of this presentation.
This presentation is offered as a guideline and each project is specific to the area that it is built in. Please contact a professional and/or building official regarding your project. Old Town Glass offers this link for educational purposes only.