Oversized returns diminish noise and strain; adjusting go back plenums adds to furnace fees however improves airflow

https://www.scribd.com/document/982336252/What-Is-the-Cost-of-a-New-Furnace-in-Ontario-in-2025-197735

Oversized returns in the reduction of noise and strain; adjusting return plenums adds to furnace costs however improves airflow and luxury at cut fan speeds.