Size Every Duct With Purpose
Design duct sizes around required airflow instead of relying on guesswork.
Duct Design
Manual D
Residential duct sizing and airflow distribution designed around calculated room-by-room requirements.
Get Your Manual D
★★★★★
Trusted by HVAC contractors, builders,
and residential project teams.
Residential Duct Design
Good Equipment Can’t Fix Bad Ductwork.
Manual D turns room loads into properly sized supply and return ductwork.
Deliver Air Where the Home Needs It
Balance airflow across rooms for better comfort and HVAC performance.
The duct sizing was clear and practical for our installation team.
★★★★★
Residential air-distribution design
Manual D Duct Design
Start at
$119
$89
SPECIAL PRICE
Professional residential duct sizing based on airflow requirements, static pressure, fittings, and system performance.
Get Your Manual D - $89Including
- Supply Duct Sizing
- Return Duct Sizing
- Room Airflow Requirements
- Available Static Pressure
- Friction Rate Review
- Equivalent Length Considerations
- Duct Routing
- Manual D Documentation
Better Comfort Starts With Better Air Distribution.
Design the duct system around the actual load.
FAQs
Questions? Let’s Clear Things Up.
What is Manual D? +
A residential duct design method used to size and distribute airflow through the HVAC system.
Do I need Manual J first? +
Usually yes. Room airflow should be based on calculated heating and cooling loads.
Do you size both supply and return ducts? +
Yes.
Do you consider static pressure? +
Yes, where required by the project scope.
Can you include registers and grilles? +
They can be considered where applicable.
Can I combine Manual D with J and S? +
Yes. The J/D/S Bundle combines all three.
How It Works
1. Share Project Info
Send plans, calculated loads, and project details.
2. We Run Manual D
We size the supply and return ductwork.
3. Review Your Design
You receive the Manual D documentation.
4. Use With Confidence
Use the design for installation planning.
Need More Than Duct Design?
Explore our full residential HVAC design services.