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).
letter-size paper. Non-ISO size typing and printing paper used almost exclusively in the US and some neighboring countries. Officially called A-size paper, it is defined by American National Standards Institute (ANSI) as 8Â½ inch wide and 11 inch tall. See also paper sizes.