Proper understanding, explanation and application of IPLV index in ARI Standard 550/590

Outlines historical development of the US ARI Standard 550/590 and the major contents of its two revisions. Presents the definitions of IPLV and NPLV, and analyses in detail the existing divergences in understanding, explaining and application for IPLV index at home, and expounds author’s view with related provisions of this standard and content of the white paper.