div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: · attic duct system to an indoor duct system reduced cooling energy use by 173% for a multispeed 21-SEER system but reduced cool- - DUCT MATERIALS The three most common duct materials src=https:reader034fdocumentsinreader034viewer20220421175e95ca8b6895e37e2c640426html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: · attic duct system to an indoor duct system reduced cooling energy use by 173% for a multispeed 21-SEER system but reduced cool- - DUCT MATERIALS The three most common duct materials src=https:reader034fdocumentsinreader034viewer20220421175e95ca8b6895e37e2c640426html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 3button div class=trans-image amp-img class=trans-thumb alt=Page 3: · attic duct system to an indoor duct system reduced cooling energy use by 173% for a multispeed 21-SEER system but reduced cool- - DUCT MATERIALS The three most common duct materials src=https:reader034fdocumentsinreader034viewer20220421175e95ca8b6895e37e2c640426html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 4button div class=trans-image amp-img class=trans-thumb alt=Page 4: · attic duct system to an indoor duct system reduced cooling energy use by 173% for a multispeed 21-SEER system but reduced cool- - DUCT MATERIALS The three most common duct materials src=https:reader034fdocumentsinreader034viewer20220421175e95ca8b6895e37e2c640426html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 5button div class=trans-image amp-img class=trans-thumb alt=Page 5: · attic duct system to an indoor duct system reduced cooling energy use by 173% for a multispeed 21-SEER system but reduced cool- - DUCT...