I know I’ve said this a lot: A duct can’t be too big. But something can…
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There’s a common misconception in the field that duct sizing is mostly about “keeping ducts small to keep the air moving.” You’ve heard it: “Smaller ducts make the air go where it’s supposed to.” But the truth is, as ACCA Manual T® makes clear, air distribution isn’t about how fast you can shove air through an airway — it’s about delivering the required volume to the supply register.
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, do A2Ls cool as well as A1 refrigerants? - December 3, 2025
- Hey Ed, Is taking static pressure measurements a good indication of a system’s airflow? - November 26, 2025
- Hey Ed, Are there ways to judge the performance of a system and prove these results to the consumer? - November 19, 2025
Posted In: Aside, Building Performance, Manual D
