Duct Design Facts w/ Jack Rise

HVAC School - For Techs, By Techs · Nov 23, 2017 · 50m

Jack Rise returns to the podcast to share some duct design facts with us and talk about his Manual D book on the ACCA website.

Before we can even start thinking about duct design, we need to think about the total effective length; even before that, we also need to think about finding the critical path. The critical path is the path with the greatest resistance to airflow (from the return to supply); the fittings in the critical path contribute to the duct's total effective length.

Flex duct is a controversial and somewhat complicated building material. It's common in Florida, but Jack doesn't…