HVAC Duct Tools Manual D

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.