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 the United States and Canada the normal size of paper is called letter size, or sometimes US letter. It is 8Â½ inches wide and 11 inches long. The other common size of paper in the US is called legal, or sometimes US legal. It is also 8Â½ inches wide, but it is 14 inches long. It is similar to the size called foolscap in Britain.