HVAC Duct Tools Manual D
Ductulator & static pressure
Free · Designed for iPad. Not verified for macOS.
Free and fully offline. Size ducts in seconds, check static pressure, design a whole system, and hand off a clean PDF schedule. No account, no ads, no tracking.
HVAC Duct Tools — Manual D duct sizing, whole-system design, and field checks, built for the trade.
Whether you're sizing a duct at the truck, checking static pressure in an attic, or handing a homeowner a full duct schedule, HVAC Duct Tools gives you defensible numbers in seconds — free, offline, no account, no tracking.
FIELD TOOLS
• Quick Size — enter CFM and get the duct size, round, rectangular, or flat-oval, with velocity and the governing constraint. The ductulator, in your pocket. Or flip it: enter an existing size and read back its honest capacity range, or scan the all-sizes table.
• Duct Check — enter an as-built duct, airflow, and role to read back friction rate and velocity, with a clear undersized / adequate / oversized verdict.
• Static Pressure Check — enter supply and return static plus the equipment's rated max to get total external static pressure (TESP), a clear over / within / under verdict, and which side dominates.
• No airflow number handy? Estimate CFM from tonnage right where you need it.
DESIGN A WHOLE SYSTEM
• Walk Setup → Friction Rate → Runs → Summary and leave with a run-by-run duct schedule.
• Static-pressure budget with honest defaults — an overridden default never masquerades as an assumption.
• Size every trunk and branch: supply and return, six duct materials, flex with compression, altitude-corrected airflow.
• In a hurry? Start from an assumed friction rate and refine when you have real numbers.
SAVE, SHARE, DELIVER
• Saved projects with automatic save — walk away mid-job, pick it up tomorrow.
• Share any result by text, or export the Summary as a clean PDF or CSV for the homeowner, the inspector, or the office.
• Light and dark mode.
BUILT HONEST
• Every result shows what it assumes, so you can sharpen it.
• Plausibility checks flag implausible inputs as "check your inputs," never a confident wrong answer.
• Stocked round sizes and role-based velocity limits reflect real-world practice.
• Anything you share or export carries the same caveats you see on screen.
PRIVATE BY DESIGN
• Works fully offline. No sign-in, no cloud, no analytics — nothing you enter leaves your phone.
HVAC Duct Tools is a field estimator based on ACCA Manual D methods. It is a professional aid, not a substitute for a stamped Manual D design or measured commissioning.
Ratings & Reviews
Sharing that travels: shared results and PDF/CSV exports now include links to the app, so a colleague can grab it in one tap. Settings adds a Tell a Colleague shortcut.
Also new: an occasional, optional feedback ask — a short email straight to the developer, never a rating nag. Plus small fixes and polish.
The developer, Mike Watson, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mike Watson
- Size
- 31.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Mike Watson