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 Printer Paper. The most standard of all printer paper sizes is 8.5 x 11 paper. At 210 mm x 297 mm, A4 is the closest and most comparable of printer paper sizes outside of North America.) Letter size paper is the size of printer and copier paper reams you will find as the default paper in almost every printer and copier.