Duct Mate: HVAC Duct Sizer is made and published by
彧 殷.
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About Duct Mate: HVAC Duct Sizer
Duct Mate: HVAC Duct Sizer is an utilities app developed by 彧 殷.
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App Information
Duct Mate: HVAC Duct Sizer is freely available from the App Store. The app size is 2.47 MB. The latest version available is 1.0. The last update was on June 30, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since June 2026.
Description by 彧 殷(from the App Store)
Duct Mate is the HVAC duct sizing tool built for the field — fast, offline, and transparent. Size ducts by CFM, analyze existing runs, find equivalent sizes, and calculate design friction rate from static pressure — all without creating an account or connecting to the internet.
CORE TOOLS — ALL IN ONE APP
▸ Duct Size by Airflow Enter CFM, choose supply/return/exhaust, pick a shape and material, tap "Size" — get a recommended duct size instantly. Switch between friction and velocity methods. Supports round, rectangular, flex, and flat oval ducts with galvanized metal, flex duct, and duct board materials.
▸ Existing Duct Analyzer Got a duct that's already installed? Enter its size to find out how much CFM it can actually handle (Capacity Solver mode), or check what velocity and friction you're getting at a given airflow (Diagnostic mode). This is the reverse-sizing feature field techs have been asking for.
▸ Equivalent Duct Calculator Convert round to rectangular, rectangular to round, round to flat oval — every equivalent size shows cross-sectional area, equivalent diameter, and velocity change. Perfect for material swaps and retrofit work.
▸ Friction Rate Helper Calculate design friction rate the Manual D way: enter external static pressure, subtract component pressure losses (coil, filter, registers, grilles), divide by total equivalent length (supply + return). Built-in TEL calculator: simply tap a straight duct run, select fittings (14 types in the library), add equivalent length — no manual lookup tables needed. One tap to apply your friction rate back to the duct sizer.
DESIGNED FOR THE FIELD
• Works completely offline — no internet, no account needed • US (IP) and SI (metric) units with one-tap switching • Keyboard input, no cumbersome sliders • Quick-pick buttons for common CFM values and friction rates • Every result shows the formula, assumptions, and warnings • Save jobs, pin favorites, share results as text
PRO FEATURES — ONE-TIME PURCHASE
Unlock everything with a single purchase. No subscriptions.
Duct Mate is not a replacement for ACCA Manual D, but it's built to support Manual D workflows. Every calculation displays: • The underlying formula and assumptions • Standard air density (0.075 lb/ft³) • Material roughness and friction factor • Velocity limits with warnings when exceeded • Aspect ratio cautions for rectangular ducts • A clear disclaimer for professional verification
TRUSTED BY HVAC PROS
No subscription. No account. No data collection. Works offline wherever the job takes you.
Download Duct Mate today — the duct sizer that works the way you do.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
