Manual D Duct Design
Properly sized supply and return ducts for balanced airflow.
What it is
Manual D produces a complete duct layout sized for the airflow each room actually needs — trunk and branch sizing, equivalent lengths, and friction-rate targets that match the selected equipment's external static pressure.
Who needs it
- New construction and gut remodels
- Permit jurisdictions that require Manual D
- Any project where comfort complaints in specific rooms have been an issue
What's included
- Trunk and branch sizing for supply and return
- Friction rate, total effective length, and pressure budget
- Marked-up plan or schematic suitable for installers
- Coordination with the Manual J and S deliverables
FAQ
Do you produce CAD drawings?
We deliver schematics and marked plans suitable for permit and installation. Full CAD drafting is available as an add-on.
Pairs well with
Most projects bundle Manual D Duct Design with the services below.
Get a same-day quote on your load calculation.
Upload your plans, get a quote within hours, and receive a permit-ready report from a named, ACCA-certified designer.