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).
A (letter) Letter sized paper measures 8.5 x 11 or 216 x 279 mm. This type of paper is the most common paper size in the U.S. Letter sized paper is used for a wide variety of printing needs including correspondence, signs, and other documents. Legal sized paper measures 8.5 x 14 or 216 x 236 mm. This type of paper is commonly used for legal documents such as contracts.