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).
A3 and A4 are international standards for paper size. They are widely used in the UK and many other countries. Not in the US, of course. Compared to US paper sizes, the A3 is close to Tabloid and the A4 to Letter. http://en.wikipedia.org/wiki/Pap...