The BPI energy auditor training course prepares individuals to understand the various components of building science, including combustion safety, blower door testing, energy analysis, and home performance assessments.
Key difference: The two paper sizes are used for different purposes in different countries. A4 paper is part of 'ISO 216-series' , while the Letter paper is a part of the old 'American National Standard Institute'. A4 is an internationally recognized paper size that measures 8.27 inches wide and 11.69 inches tall. All âAâ sizes has an aspect ratio of 1: â 2 (square root of 2).
In Europe and other places an international system of paper sizes is used. The normal size of paper is called A4. It is measured in metric. It is 210 millimeters wide and 297 millimeters long. This is about the size of US letter, but it is a little narrower, and a little longer. The other common size of paper in Europe is called B5. It is 176 millimeters wide by 250 millimeters long.