Privacy Policy

1. Summary

HVAC Duct Flow (Turkish name: HVAC Kanal ve Menfez Hesabı) is an offline calculator for duct and grille sizing. The app does not collect, store on a server, sell or share any personal data. It has no user accounts, no advertising, no analytics SDKs and no third-party trackers, and it does not connect to the internet.

2. Data stored on your device

Your settings (units, velocity limits, grille coefficients, default air conditions) and your last calculation inputs are saved only on your device using standard iOS storage (UserDefaults) so the app opens where you left it. This data never leaves your device and is removed when you delete the app.

3. PDF reports

PDF reports are generated on your device. They are only shared when you choose to share them through the iOS share sheet (e.g. Mail, Messages, Files). Where a report goes is entirely under your control; the developer never receives it.

4. Data we do not collect

• No name, email or account information
• No location data
• No contacts, photos or files
• No payment information (the app is free and has no in-app purchases)
• No usage analytics or advertising identifiers

5. Apple

If you have enabled Share with App Developers in iOS settings, Apple may provide the developer with anonymous crash reports and aggregate App Store statistics. These do not identify you. See Apple's privacy policy for details.

6. Children

The app is a professional engineering tool and is not directed at children under 13. It collects no data from anyone.

7. Changes

If this policy changes, the updated version will be published on this page with a new date.

8. Contact

Questions about this policy: