div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Flow Diagram:HeatingVentilation Air Conditioning Svc src=https:reader031vdocumentsnetreader031viewer20220120226169bd6f11a7b741a34ad494html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: Flow Diagram:HeatingVentilation Air Conditioning Svc src=https:reader031vdocumentsnetreader031viewer20220120226169bd6f11a7b741a34ad494html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdiv