Correct duct transitions and plenums at some point of setting up scale down turbulence and noise
https://privatebin.net/?d8ccee421aed3fe1#A4gNatGkLTfq4L7xC7GizftR4G1HFgjdhZDgJNf473F4
Correct duct transitions and plenums for the period of install lessen turbulence and noise, enhancing airflow and extending furnace component life.