Correct duct transitions and plenums in the course of installation cut back turbulence and noise
https://padlet.com/ca6465823ykaml/bookmarks-hzwrcd13fbpc0tud/wish/pRxDZ4PVr86MZ183
Correct duct transitions and plenums right through installing lessen turbulence and noise, convalescing airflow and increasing furnace part life.