Duct Flow Calc HVAC Tool2026

Offline HVAC duct and airflow

Only for iPhone

USD 0.29 · Designed for iPhone. Not verified for macOS.

iPhone

An offline duct calculation tool for HVAC, ventilation work, and field checks. Buy once and use long term without login or network access. Duct Flow Calc is an offline utility for HVAC and ventilation field work. It helps you quickly calculate airflow, air velocity, duct size, and round-to-rectangular duct equivalence. All data is stored only on your device. No login, no network connection, and no user data collection are required. Core features: 1. Convert airflow, velocity, and cross-sectional area with common unit switching. 2. Recommend rectangular duct sizes and derive width-height combinations from a target velocity. 3. Convert between circular and rectangular equivalent ducts for easier design comparison. 4. Estimate simple resistance and show velocity range hints to reduce field sizing mistakes. 5. Save local project records, including rooms, floors, system numbers, and calculation results. This app is suitable for HVAC design assistants, site engineers, ventilation installers, and cost estimators working on construction sites, plant rooms, and field surveys without reliable internet access.

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The developer, hao du, 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.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Provider
    • hao du
    Size
    • 720.9 KB
    Category
    • Utilities
    Compatibility
    Requires iOS 15.6 or later.
    • iPhone
      Requires iOS 15.6 or later.
    • iPod touch
      Requires iOS 15.6 or later.
    • Mac
      Requires macOS 12.5 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 8 more
    • English, French, German, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish
    Age Rating
    4+
    Copyright
    • © ductFlowCalc-dh-2026
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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