AppMarketSpy › Utilities › DuctCalc: HVAC Ductulator
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App info
- Developer
- Grima Hdez
- Category
- Utilities, Productivity
- Released
- Oct 9, 2026
- Version
- 1.2.0 (Oct 19, 2026)
- Price
- Free
- Size
- 2.3 MB
- Requires
- iOS 17.0
- Age rating
- 4+
- Languages
- English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean,…
In-app purchases
| DuctCalc Pro | $4.99 |
Current prices, App Store US.
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About DuctCalc: HVAC Ductulator
A ductulator that does the whole job, not just the wheel. SIZE THE DUCT Enter CFM and friction rate, get the required round diameter. Or work the other way: enter a duct you already have and read back the velocity and the friction rate it will run at. RECTANGULAR EQUIVALENTS Every round size comes with its rectangular equivalents, listed by aspect ratio, so you can pick the one that fits the joist bay instead of doing the conversion in your head on a ladder. STOCK SIZES, NOT THEORY A calculator that answers 7.3 inches is a calculator you have to correct. Snap to the sizes the shop actually stocks. MATERIAL ROUGHNESS Galvanized, flex, fiberglass duct board, spiral. The friction rate is not the same in all of them and the app does not pretend it is. VELOCITY GUIDE Recommended velocity bands by application — main trunk, branch, return — so a number that is technically fine but noisy in a…
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