Manual D Duct Design
Duct Layouts Engineered for Airflow, Comfort & Code Compliance
At Elements Design Group, we offer Manual D duct design services that go beyond lines on a layout. Our designs are engineered for balanced airflow, quiet operation, and efficient performance—because ductwork is more than a connection; it’s the backbone of HVAC system comfort.
Every project we deliver is tailored using data from your Manual J calculation, sized using Manual D methodology, and formatted to meet permitting and installer requirements.
Whether you’re building a new home or revising plans to pass inspection, our Manual D HVAC designs are optimized for both code compliance and real-world installation.
What Is Manual D?
Manual D is the ACCA standard for residential ductwork design. It uses the results from your Manual J load calculation to determine proper duct sizing and layout—ensuring the air distribution system delivers the right airflow to each room.
A true Manual D calculation considers:
- Room-by-room airflow requirements (CFM)
- Duct length, material type, shape, and layout
- Friction loss, static pressure, and air velocity
- Fan performance curves and system efficiency
Our team designs to ACCA Manual D standards using professional-grade software like Wrightsoft. Every layout is reviewed by a licensed HVAC designer for accuracy and compliance.
What You Get With Our Manual D Service
- Professionally engineered duct layout drawings (PDF + CAD if needed)
- Calculated supply and return airflows (CFM) for each zone
- Friction loss and duct sizing chart
- Summary sheet with static pressure and velocity metrics
- Ready-to-submit format for local code authorities
- Turnaround time: 2–3 business days
- Includes up to 2 rounds of revisions
Designed for Contractors and Builders
You don’t need another generic sketch. You need ductwork that’s sized, balanced, and easy to install. That’s what we deliver.
- Layouts optimized for real-world installations
- Designed with common material types (flex, rigid, etc.)
- Available in single system or zoned configurations
- Integrates seamlessly with your Manual J and Manual S documents
- Code-compliant in all 50 states, including IECC requirements
Add-On Services That Complement Manual D
Need a complete mechanical design package? We offer:
We’ll work from one set of plans and provide everything you need to move through permitting and into installation—without delays or guesswork.
Why Choose Our HVAC System Design Services?
Licensed HVAC system designers
Professionally trained and certified to deliver accurate, code-compliant designs.
Easy-to-read reports for permit approvals
Formatted for quick review by inspectors and permit officials — no confusion, no delays.
Fast turnaround and friendly communication
Get responsive support and designs delivered in days, not weeks.
Residential and custom home specialists
Tailored HVAC layouts and load calculations for single-family and custom builds.
ACCA Manual J, D, and S compliant
All designs follow the latest ACCA standards for system sizing and airflow.
Trusted by contractors and homeowners
We support builders and homeowners nationwide with practical, permit-ready designs.
Frequently Asked Questions
Duct area is calculated using the formula for the shape (round or rectangular). For round ducts:
Area = π × (Diameter ÷ 2)²
But in Manual D design, we base area on the airflow (CFM) required, then size ducts using friction rate, velocity, and static pressure loss to determine area and diameter.
We calculate equivalent duct diameter based on duct shape, material, and friction loss. This is especially useful when converting between rectangular and round ducts. It’s part of every detailed duct design we deliver.
The “2-foot rule” refers to a practical guideline where flexible ducts should have no more than 2 feet of excess length and should be pulled tight to minimize friction loss. While not part of ACCA standards, we account for installation constraints like this when creating designs.
Get Ductwork Designed Right the First Time
Don’t leave airflow to assumptions. Our Manual D duct design service ensures your system delivers comfort, meets code, and installs without surprises. Trusted by builders, ready for permitting.
Request a Quote
Email :
info@elementdesigngroup.com
Phone :
(480) 696-1060