# HVAC Duct Tools Manual D — Duct Sizing & Static Pressure > HVAC duct sizing and field check utility based on ACCA Manual D. (iPhone/iPad app by Mike Watson.) - Source: https://appshunter.io/ios/app/hvac-duct-tools-manual-d/id6786886923 (this page in markdown: same URL + `.md`) - Developer: [Mike Watson](https://appshunter.io/developer/1848411021) - Category: Utilities, Business - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 30 MB - Languages: American English - Released: 2026-07-09 - Data updated: 2026-08-13 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/hvac-duct-tools-manual-d/id6786886923/reviews.md ## What is 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. ## Key features - Quick duct sizing (round/rectangular) - Duct friction rate and velocity checks - Static pressure calculations - Offline functionality - No account or tracking required - Plausibility checks for inputs ## Frequently asked questions about HVAC Duct Tools Manual D ### What is HVAC Duct Tools Manual D used for? HVAC Duct Tools Manual D is used by HVAC professionals for on-site duct sizing and field checks, following ACCA Manual D methods. It provides quick calculations for duct size, velocity, friction rate, and static pressure directly from your mobile device. ### Does HVAC Duct Tools Manual D require an internet connection? No, HVAC Duct Tools Manual D works fully offline. It is designed for field use and does not require an internet connection, sign-in, or cloud access, ensuring your data remains private. ### How does HVAC Duct Tools Manual D ensure accuracy? The app includes plausibility checks that flag potentially incorrect inputs, preventing confident wrong answers. It also clearly states its assumptions for each result, allowing users to refine their inputs for more precise calculations. ### What devices is HVAC Duct Tools Manual D available on? HVAC Duct Tools Manual D is available for iPhone and iPad devices. It is designed to be a portable tool for professionals working on various job sites. ### How often is HVAC Duct Tools Manual D updated? The latest version of HVAC Duct Tools Manual D is 1.6.2, which was last updated on July 14, 2026. Updates typically focus on refining features and ensuring compatibility with the latest operating systems. ### What is the age rating for HVAC Duct Tools Manual D? HVAC Duct Tools Manual D has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions. ### Does HVAC Duct Tools Manual D have ads? No, HVAC Duct Tools Manual D is ad-free. The app prioritizes a clean user experience for professionals in the field, without any advertisements interrupting its functionality. ### How does HVAC Duct Tools Manual D compare to traditional duct calculators? HVAC Duct Tools Manual D acts as a portable ductulator, offering instant calculations for duct sizing, velocity, and static pressure directly on your phone or tablet. It provides real-time feedback and checks that are faster and more convenient than manual calculations or separate desktop software. ## Version history (last 5 releases) ### 1.7.0 — 2026-08-12 Smarter air & flex math — temperature/elevation density in one place, plus separate flex compression and sag penalties so field installs size more realistically Clearer field warnings — soft “approaching limit” and hard over-limit flags on velocity/friction (noise-risk heuristics, not lab NC/RC) Quick Size upgrades — hold friction rate or target velocity while switching Round / Rectangular / Flat Oval without size drift ### 1.6.3 — 2026-07-26 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. ### 1.6.2 — 2026-07-14 -Updated name of app ### 1.6.1 — 2026-07-12 - Check existing ductwork, not just design new — enter a duct size and see the CFM it can actually move (min/ideal/max), with an honest answer for flex at real-world compression. - Full Manual-D system design — build a whole job (Setup → friction rate → runs → schedule), now with saved projects that survive closing the app. - Share it like a pro — export the duct schedule as a PDF or CSV to hand a homeowner, attach to a bid, or drop in a job file. - Answers that start where you do — size from equipment tonnage when you don't have a CFM in hand, and check a duct before you know its target airflow. - Cleaner, faster screens — a redesigned fitting picker, tidier setup and result cards, progress markers across the design tabs, and dark mode. - Flat-oval, all-sizes table, and altitude correction for the jobs that need them. - Fresh app icon. ### 1.0 — 2026-07-09 No release notes. ## More apps by Mike Watson - [Leafed - Private Book Tracker](https://appshunter.io/ios/app/leafed-private-book-tracker/id6754466418) - [HVAC Load Calculator Manual J](https://appshunter.io/ios/app/hvac-load-calculator-manual-j/id6758120488) - [Water Damage Report Photo Docs](https://appshunter.io/ios/app/water-damage-report-photo-docs/id6758919407) - [Pesticide Mix Calculator](https://appshunter.io/ios/app/pesticide-mix-calculator/id6759580852) - [A2L Safe Charge - Superheat](https://appshunter.io/ios/app/a2l-safe-charge-superheat/id6760899340) - [Attentionly: Time Audit](https://appshunter.io/ios/app/attentionly-time-audit/id6761147386) All apps by Mike Watson: https://appshunter.io/developer/1848411021 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*