Manual D® or duct design: How are you calculating airways?
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Something I’ve observed for quite some time, but it seems to need more attention lately, is how we are actually sizing airways— commonly referred to as ductwork. I appreciate when people say they’re using the Manual D® process when discussing duct designs.
Manager of HVAC Design Education at ACCA
Ed Janowiak is ACCA's Manager of HVAC Design Education and can be reached at ed.janowiak@acca.org or 703-824-8878.
Latest posts by Ed Janowiak (see all)
- Hey Ed, is 400 CFM always the correct airflow? - October 15, 2025
- Hey Ed, What’s the difference between 100 CFM coming out of a metal duct or a flex duct? - October 8, 2025
- Hey Ed, Does the new Manual S® still have a path to size based on AC requirement? - October 1, 2025
Posted In: ACCA Now, Aside, Manual D, Residential, Residential Technical Tips
